Remove Pkg.update() from CI workflow

- The Update dependencies step was causing issues with git URL rewriting
- julia-actions/julia-buildpkg already handles dependency installation
- Removes redundant dependency update that was failing due to hostname resolution

Author: Keno

.github/workflows/CI.yml

@@ -64,8 +64,6 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
         with:
           git_cli: true
-      - name: Update dependencies
-        run: julia --project=@. -e 'using Pkg; Pkg.update()'
       - uses: julia-actions/julia-runtest@v1
         with:
           force_latest_compatible_version: false