Backport tzdata fixes for postgresql 15

This was discussed upstream here:
https://postgr.es/m/0a997455-5aba-4cf2-a354-d26d8bcbfae6%40technowledgy.de

Also applied by nixpkgs here: NixOS/nixpkgs#342026

Author: jfroche

nix/postgresql/generic.nix

@@ -7,6 +7,7 @@ let
       stdenv,
       lib,
       fetchurl,
+      fetchpatch,
       makeWrapper,
       glibc,
       zlib,
@@ -198,6 +199,20 @@ let
             locale = "${if stdenv.isDarwin then darwin.adv_cmds else lib.getBin stdenv.cc.libc}/bin/locale";
           })
         ]
+        ++ lib.optionals (olderThan "17") [
+          # back port changes related to tzdata release 2024b
+          (fetchpatch ({
+            url = "https://github.com/postgres/postgres/commit/b27622c90869aab63cfe22159a459c57768b0fa4.patch";
+            hash = "sha256-7G+BkJULhyx6nlMEjClcr2PJg6awgymZHr2JgGhXanA=";
+            excludes = [ "doc/*" ];
+          }))
+          # back port changes related to tzdata release 2025a
+          (fetchpatch ({
+            url = "https://github.com/postgres/postgres/commit/aac0384975ff1129557cd2158fab4656f933cdc8.patch";
+            hash = "sha256-4Aua4QJhCS9B0zegQ9I6Us5QfX7GuRUilnkmOpSTUUw=";
+            excludes = [ "doc/*" ];
+          }))
+        ]
         ++ lib.optionals stdenv'.hostPlatform.isMusl (
           # Using fetchurl instead of fetchpatch on purpose: https://github.com/NixOS/nixpkgs/issues/240141
           map fetchurl (lib.attrValues muslPatches)