Bump librt from 0.6.3 to 0.7.3 (#11812)

Bumps [librt](https://github.com/mypyc/librt) from 0.6.3 to 0.7.3.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/mypyc/librt/commit/7e053f113df4bf601b7a69e91c2a4a9888bf6d1a"><code>7e053f1</code></a>
Sync mypy to bring new setup structure (<a
href="https://redirect.github.com/mypyc/librt/issues/24">#24</a>)</li>
<li><a
href="https://github.com/mypyc/librt/commit/fd8972fb8a6db60d664d2c8af92510207cc6157a"><code>fd8972f</code></a>
Force-include all C files (<a
href="https://redirect.github.com/mypyc/librt/issues/23">#23</a>)</li>
<li><a
href="https://github.com/mypyc/librt/commit/bd2a8e897e72bb291a2f3efdab112ec6f080dfc1"><code>bd2a8e8</code></a>
Include headers recursively (<a
href="https://redirect.github.com/mypyc/librt/issues/22">#22</a>)</li>
<li><a
href="https://github.com/mypyc/librt/commit/05b3cccb164a58db75c91c4da34945755a5b5d13"><code>05b3ccc</code></a>
Sync mypy including the stubs (<a
href="https://redirect.github.com/mypyc/librt/issues/14">#14</a>)</li>
<li><a
href="https://github.com/mypyc/librt/commit/abf92aab269421d4c11baa98d35c21e96567b2f1"><code>abf92aa</code></a>
Fix Markdown</li>
<li><a
href="https://github.com/mypyc/librt/commit/fd8d11825501ecf51afb95edd1d51a2ee3cb2e24"><code>fd8d118</code></a>
Add some developer notes</li>
<li>See full diff in <a
href="https://github.com/mypyc/librt/compare/v0.6.3...v0.7.3">compare
view</a></li>
</ul>
</details>
<br />


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requirements/constraints.txt

@@ -102,7 +102,7 @@ jinja2==3.1.6
     # via
     #   sphinx
     #   towncrier
-librt==0.6.3
+librt==0.7.3
     # via mypy
 markdown-it-py==4.0.0
     # via rich

requirements/dev.txt

@@ -100,7 +100,7 @@ jinja2==3.1.6
     # via
     #   sphinx
     #   towncrier
-librt==0.6.3
+librt==0.7.3
     # via mypy
 markdown-it-py==4.0.0
     # via rich

requirements/lint.txt

@@ -43,7 +43,7 @@ iniconfig==2.3.0
     # via pytest
 isal==1.7.2
     # via -r requirements/lint.in
-librt==0.6.3
+librt==0.7.3
     # via mypy
 markdown-it-py==4.0.0
     # via rich

requirements/test-common.txt

@@ -34,7 +34,7 @@ iniconfig==2.3.0
     # via pytest
 isal==1.8.0 ; python_version < "3.14"
     # via -r requirements/test-common.in
-librt==0.6.3
+librt==0.7.3
     # via mypy
 markdown-it-py==4.0.0
     # via rich

requirements/test-ft.txt

@@ -55,7 +55,7 @@ iniconfig==2.3.0
     # via pytest
 isal==1.8.0 ; python_version < "3.14"
     # via -r requirements/test-common.in
-librt==0.6.3
+librt==0.7.3
     # via mypy
 markdown-it-py==4.0.0
     # via rich

requirements/test.txt

@@ -55,7 +55,7 @@ iniconfig==2.3.0
     # via pytest
 isal==1.7.2 ; python_version < "3.14"
     # via -r requirements/test-common.in
-librt==0.6.3
+librt==0.7.3
     # via mypy
 markdown-it-py==4.0.0
     # via rich