Merge pull request haskell#10446 from haskell/mergify/bp/3.14/pr-10445

switch validate to 22.04 for now (backport haskell#10445)

.github/workflows/validate.yml

@@ -62,7 +62,7 @@ jobs:
       matrix:
         sys:
           - { os: windows-latest, shell: "C:/msys64/usr/bin/bash.exe -e {0}" }
-          - { os: ubuntu-latest, shell: bash }
+          - { os: ubuntu-22.04, shell: bash }
           - { os: macos-13, shell: bash }
         # If you remove something from here, then add it to the old-ghcs job.
         # Also a removed GHC from here means that we are actually dropping
@@ -233,7 +233,7 @@ jobs:
 
   validate-old-ghcs:
     name: Validate old ghcs ${{ matrix.extra-ghc }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: validate
 
     strategy:
@@ -362,7 +362,7 @@ jobs:
     needs: validate
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-13, windows-latest]
+        os: [ubuntu-22.04, macos-13, windows-latest]
         # We only use one ghc version the used one for the next release (defined at top of the workflow)
         # We need to build an array dynamically to inject the appropiate env var in a previous job,
         # see https://docs.github.com/en/actions/learn-github-actions/expressions#fromjson