ci: bump actions/checkout to v3 also for CodeQL

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 73f8078..3799c2d 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -24,7 +24,7 @@
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v2