Pin GitHub Actions runners to a specific version (#765)

Author: ErikSchierboom

Diff for: .github/workflows/config-checker.yml

@@ -5,7 +5,7 @@ on: [push, pull_request]
 jobs:
   config-check:
     timeout-minutes: 30
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     container:
       image: clfoundation/sbcl

Diff for: .github/workflows/configlet-sync.yml

@@ -9,7 +9,7 @@ jobs:
   configlet:
     if: github.repository_owner == 'exercism' # Stops this job from running on forks
     timeout-minutes: 30
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     steps:
     - uses: actions/checkout@v4

Diff for: .github/workflows/test-exercises.yml

@@ -5,7 +5,7 @@ on: [push, pull_request]
 jobs:
   run-tests:
     timeout-minutes: 30
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     container:
       image: clfoundation/sbcl