Updated workflow runners

.github/workflows/docs.yml

@@ -21,7 +21,7 @@ jobs:
   docs:
     name: Deploy docs
     # better to use pinned version here
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v2

.github/workflows/draft.yml

@@ -20,7 +20,7 @@ jobs:
   draft:
     name: Update draft release
     # better to use pinned version here
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: release-drafter/release-drafter@v5
         with:

.github/workflows/registry.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   registry:
     name: Publish Docker image to GitHub registry
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     permissions:
       contents: read
       packages: write

.github/workflows/test-docker.yml

@@ -34,7 +34,7 @@ on:
 jobs:
   test-docker:
     name: Run tests inside Docker container
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - # get repository code
         name: Checkout