CI: don't use ubuntu-latest (#247)

.github/workflows/check-build-test.yml

@@ -21,7 +21,7 @@ env:
 jobs:
   check-code-style:
     name: Check Code Style
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -52,7 +52,7 @@ jobs:
 
   check-code-compilation:
     name: Check Code Compilation
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -81,7 +81,7 @@ jobs:
 
   check-docs:
     name: Check Docs
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -185,7 +185,7 @@ jobs:
   build-benchmark:
     name: Build benchmarks
     needs: [check-code-style, check-code-compilation, check-docs]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4

.github/workflows/format.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   build:
     name: Code is formatted
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout current branch (full)
         uses: actions/checkout@v4

.github/workflows/headers.yml

@@ -8,7 +8,7 @@ permissions: {}
 jobs:
   check-headers:
     name: Check headers
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4

.github/workflows/link-validator.yml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   validate-links:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4

.github/workflows/publish-1.0-docs.yml

@@ -6,7 +6,7 @@ on:
 jobs:
   publish-docs:
     name: Publish documentation to nightlies.apache.org
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     if: github.repository == 'apache/pekko-connectors-kafka'
     steps:
       - name: Checkout

.github/workflows/publish-1.1-docs.yml

@@ -6,7 +6,7 @@ on:
 jobs:
   publish-docs:
     name: Publish documentation to nightlies.apache.org
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     if: github.repository == 'apache/pekko-connectors-kafka'
     steps:
       - name: Checkout

.github/workflows/publish-nightly.yml

@@ -28,7 +28,7 @@ permissions:
 jobs:
   publish-nightly:
     name: Publish nightly
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     if: github.repository == 'apache/pekko-connectors-kafka'
     steps:
       - name: Checkout