Update codeql-analysis.yml

Author: alexdlaird

.github/workflows/codeql-analysis.yml

@@ -19,15 +19,6 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-        with:
-          # We must fetch at least the immediate parents so that if this is
-          # a pull request then we can checkout the head.
-          fetch-depth: 2
-
-      # If this run was triggered by a pull request event, then checkout
-      # the head of the pull request instead of the merge commit.
-      - run: git checkout HEAD^2
-        if: ${{ github.event_name == 'pull_request' }}
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL