Sync feature/spring-boot-2.x readme (#807)

Author: Netyyyy

.github/workflows/markdown-link-check.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 jobs:
   markdown-link-check:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04 #workaround https://github.com/UmbrellaDocs/action-linkspector/issues/32
     steps:
     - uses: actions/checkout@master
     - uses: umbrelladocs/action-linkspector@v1.1.3