ci: unbreak show-spring-boot-version-diff.sh script by updating Ubunt…

…u image to bring newer curl

--fail-with-body option has been added to curl in 7.76.0 while Ubuntu 20.04 contains 7.68.0. Update
to newer Ubuntu will bring us curl 7.81.0 that should fix the issue.

See also:
- https://github.com/actions/runner-images/blob/266f9413d39fc77ade974757b633ef98873c9c21/images/ubuntu/Ubuntu2004-Readme.md
- https://github.com/actions/runner-images/blob/266f9413d39fc77ade974757b633ef98873c9c21/images/ubuntu/Ubuntu2204-Readme.md

Correction for 225fe81 commit.

Part of #1657

Fix #1653

.github/workflows/dependencies-diff.yml

@@ -26,7 +26,7 @@ jobs:
   show-spring-boot-version-diff:
     name: Run show-spring-boot-version-diff.sh
     # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idruns-on
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Clone source code
         uses: actions/[email protected] # https://github.com/actions/checkout