Fixing auto-checkout issues

.gitea/workflows/Merge-Checker.yaml

@@ -57,7 +57,9 @@ jobs:
 
           BRANCH_NAME="${{ github.event.pull_request.head.ref }}"
           git stash
-          git checkout "$BRANCH_NAME" "origin/$BRANCH_NAME"
+          echo "Checking out source branch $BRANCH_NAME"
+          git fetch origin "$BRANCH_NAME"
+          git checkout "$BRANCH_NAME"
           git pull
 
           echo "Checking if last commit was a timing update"
@@ -70,8 +72,7 @@ jobs:
             echo "Last commit name was: $LAST_COMMIT_MSG"
           fi
 
-          echo "Checking out source branch $BRANCH_NAME"
-          git fetch origin "$BRANCH_NAME"
+          
           git stash pop
 
           git add unit-tests/timing-results/matrix-timing-tests.txt