Fix CodeQL workflow: full checkout depth for Nerdbank.GitVersioning

The Build step ran a shallow clone, so dotnet build failed before
analyze ever ran - NBGV needs full git history to compute a version,
same reason ci.yml's checkout already sets fetch-depth: 0.

Author: GREENFONTS

.github/workflows/codeql.yml

@@ -17,6 +17,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # full history - Nerdbank.GitVersioning needs it to compute the version
 
       - uses: actions/setup-dotnet@v4
         with: