chore(deps-dev): update pygments requirement from <2.20 to <2.21

[dependabot]

Updates the requirements on pygments to permit the latest version.

Release notes

Sourced from pygments's releases.

2.20.0

• New lexers:

  • Rell (#2914)

• Updated lexers:

  • archetype: Fix catastrophic backtracking in GUID and ID patterns (#3064)
  • ASN.1: Recognize minus sign and fix range operator (#3014, #3060)
  • C++: Add C++26 keywords (#2955), add integer literal suffixes (#2966)
  • ComponentPascal: Fix analyse_text (#3028, #3032)
  • Coq renamed to Rocq (#2883, #2908)
  • Cython: Various improvements (#2932, #2933)
  • Debian control: Improve architecture parsing (#3052)
  • Devicetree: Add support for overlay/fragments (#3021), add bytestring support (#3022), fix catastrophic backtracking (#3057)
  • Fennel: Various improvements (#2911)
  • Haskell: Handle escape sequences in character literals (#3069, #1795)
  • Java: Add module keywords (#2955)
  • Lean4: Add operators ]', ]?, ]! (#2946)
  • LESS: Support single-line comments (#3005)
  • LilyPond: Update to 2.25.29 (#2974)
  • LLVM: Support C-style comments (#3023, #2978)
  • Lua(u): Fix catastrophic backtracking (#3047)
  • Macaulay2: Update to 1.25.05 (#2893), 1.25.11 (#2988)
  • Mathematica: Various improvements (#2957)
  • meson: Add additional operators (#2919)
  • MySQL: Update keywords (#2970)
  • org-Mode: Support both schedule and deadline (#2899)
  • PHP: Add __PROPERTY__ magic constant (#2924), add reserved keywords (#3002)
  • PostgreSQL: Add more keywords (#2985)
  • protobuf: Fix namespace tokenization (#2929)
  • Python: Add t-string support (#2973, #3009, #3010)
  • Tablegen: Fix infinite loop (#2972, #2940)
  • Tera Term macro: Add commands introduced in v5.3 through v5.6 (#2951)
  • TOML: Support TOML 1.1.0 (#3026, #3027)
  • Turtle: Allow empty comment lines (#2980)
  • XML: Added .xbrl as file ending (#2890, #2891)

• Drop Python 3.8, and add Python 3.14 as a supported version (#2987, #3012)

• Various improvements to autopygmentize (#2894)

• Update onedark style to support more token types (#2977)

• Update rtt style to support more token types (#2895)

• Cache entry points to improve performance (#2979)

• Fix xterm-256 color table (#3043)

• Fix kwargs dictionary getting mutated on each call (#3044)

Changelog

Sourced from pygments's changelog.

Version 2.20.0

(released March 29th, 2026)

• New lexers:

  • Rell (#2914)

• Updated lexers:

  • archetype: Fix catastrophic backtracking in GUID and ID patterns (#3064)
  • ASN.1: Recognize minus sign and fix range operator (#3014, #3060)
  • C++: Add C++26 keywords (#2955), add integer literal suffixes (#2966)
  • ComponentPascal: Fix analyse_text (#3028, #3032)
  • Coq renamed to Rocq (#2883, #2908)
  • Cython: Various improvements (#2932, #2933)
  • Debian control: Improve architecture parsing (#3052)
  • Devicetree: Add support for overlay/fragments (#3021), add bytestring support (#3022), fix catastrophic backtracking (#3057)
  • Fennel: Various improvements (#2911)
  • Haskell: Handle escape sequences in character literals (#3069, #1795)
  • Java: Add module keywords (#2955)
  • Lean4: Add operators ]', ]?, ]! (#2946)
  • LESS: Support single-line comments (#3005)
  • LilyPond: Update to 2.25.29 (#2974)
  • LLVM: Support C-style comments (#3023, #2978)
  • Lua(u): Fix catastrophic backtracking (#3047)
  • Macaulay2: Update to 1.25.05 (#2893), 1.25.11 (#2988)
  • Mathematica: Various improvements (#2957)
  • meson: Add additional operators (#2919)
  • MySQL: Update keywords (#2970)
  • org-Mode: Support both schedule and deadline (#2899)
  • PHP: Add __PROPERTY__ magic constant (#2924), add reserved keywords (#3002)
  • PostgreSQL: Add more keywords (#2985)
  • protobuf: Fix namespace tokenization (#2929)
  • Python: Add t-string support (#2973, #3009, #3010)
  • Tablegen: Fix infinite loop (#2972, #2940)
  • Tera Term macro: Add commands introduced in v5.3 through v5.6 (#2951)
  • TOML: Support TOML 1.1.0 (#3026, #3027)
  • Turtle: Allow empty comment lines (#2980)
  • XML: Added .xbrl as file ending (#2890, #2891)

• Drop Python 3.8, and add Python 3.14 as a supported version (#2987, #3012)

• Various improvements to autopygmentize (#2894)

• Update onedark style to support more token types (#2977)

• Update rtt style to support more token types (#2895)

• Cache entry points to improve performance (#2979)

• Fix xterm-256 color table (#3043)

• Fix kwargs dictionary getting mutated on each call (#3044)

Version 2.19.2

... (truncated)

Commits

• 708197d Fix underline length.
• 1d4538a Prepare 2.20 release.
• 2ceaee4 Update CHANGES.
• e3a3c54 Fix Haskell lexer: handle escape sequences in character literals (#3069)
• d7c3453 Merge pull request #3071 from pygments/harden-html-formatter
• 0f97e7c Harden the HTML formatter against CSS.
• 9f981b2 Update CHANGES.
• 1d88915 Update CHANGES.
• c3d93ad Fix ASN.1 lexer: recognize minus sign and fix range operator (#3060)
• 4f06bcf fix bad behaving backtracking regex in CommonLispLexer
• Additional commits viewable in compare view