Merge branch '5.2' into 5.x

* 5.2:
  Enhancement: Use actions/cache v2

Author: OskarStark

.github/workflows/ci.yaml

@@ -98,7 +98,7 @@ jobs:
                 id: extract_base_branch
 
             -   name: "Cache DOCtor-RST"
-                uses: actions/cache@v1
+                uses: actions/cache@v2
                 with:
                     path: .cache
                     key: ${{ runner.os }}-doctor-rst-${{ steps.extract_base_branch.outputs.branch }}