ci: remove ggshield iac

ggshield iac no longer exists.

Author: GG-HH

.github/workflows/main.yml

@@ -86,17 +86,3 @@ jobs:
           GITHUB_PULL_BASE_SHA: ${{ github.event.pull_request.base.sha }}
           GITHUB_DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
           GITGUARDIAN_API_KEY: ${{ secrets.GITGUARDIAN_API_KEY }}
-
-  ggshield-iac:
-    name: Check for iac vulnerabilities with ggshield
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-
-      - name: GitGuardian iac scan test
-        uses: GitGuardian/gg-shield/actions/iac@main
-        with:
-          args: ./
-        env:
-          GITHUB_DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
-          GITGUARDIAN_API_KEY: ${{ secrets.GITGUARDIAN_API_KEY }}