Revert "Use action/checkout fetch-depth instead of manually fetch (op…

…en-telemetry#4535)" (open-telemetry#4560)

Fixes open-telemetry#4559

This reverts commit 5405247.

Signed-off-by: Juraci Paixão Kröhling <[email protected]>

.github/workflows/changelog.yml

@@ -16,14 +16,13 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-        with:
-          # Only the latest commit of the feature branch is available
-          # automatically. To diff with the base branch, we need to
-          # fetch that too (and we only need its latest commit).
-          fetch-depth: 1
 
       - name: Check for CHANGELOG changes
         run: |
+          # Only the latest commit of the feature branch is available
+          # automatically. To diff with the base branch, we need to
+          # fetch that too (and we only need its latest commit).
+          git fetch origin ${{ github.base_ref }} --depth=1
           if [[ $(git diff --name-only FETCH_HEAD | grep CHANGELOG) ]]
           then
             echo "A CHANGELOG was modified. Looks good!"