Update sonarcloud.yml (matrix-org#2411)

Author: t3chguy

.github/workflows/sonarcloud.yml

@@ -53,11 +53,11 @@ jobs:
 
       # Fetch base branch from the upstream repo so that Sonar can identify new code in PR builds
       - name: "📕 Fetch upstream base branch"
-        # workflow_call retains the github context of the caller, so `repositoryUrl` will be upstream always due
+        # workflow_call retains the github context of the caller, so `repository` will be upstream always due
         # to it running on `workflow_run` which is called from the context of the target repo and not the fork.
         if: inputs.base_branch
         run: |
-          git remote add upstream ${{ github.repositoryUrl }}
+          git remote add upstream https://github.com/${{ github.repository }}
           git rev-parse HEAD
           git fetch upstream ${{ inputs.base_branch }}:${{ inputs.base_branch }}
           git status