GitHub actions warning fix

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>

.github/workflows/codeql-analysis.yml

@@ -26,20 +26,11 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v2
-      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
     - name: Install dependencies
       run: |
         sudo apt-get update -qq
         sudo apt-get install -qq libpcre3-dev libssl-dev zlib1g-dev libzstd-dev libjansson-dev libc6-dev libpng-dev libjpeg-dev libtiff-dev libcups2-dev libfreetype6-dev libfontconfig1-dev libdbus-1-dev libicu-dev unixodbc-dev libpq-dev libsqlite3-dev xorg-dev
 
-    # 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
       uses: github/codeql-action/init@v1