Update workflow to use Ubuntu 22.04.

Author: hodgestar

.github/workflows/release.yml

@@ -10,7 +10,7 @@ on:
 jobs:
   build_sdist:
     name: Build sdist
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
 
@@ -38,7 +38,7 @@ jobs:
 
   build_generic_wheel:
     name: Build generic wheel (without speedups)
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     env:
       # Build a wheel without speedups that can run on pure Python
       GENSHI_BUILD_SPEEDUP: 0