ci: add ssh:// insteadOf rule to cover Terraform URL normalization

Terraform normalizes SCP-style SSH sources (git@host:path) to ssh:// URLs
before invoking git, so the previous insteadOf rule for 'git@github.e.it.census.gov:'
did not match. Added a second rule for 'ssh://git@github.e.it.census.gov/' so
both URL forms are rewritten to authenticated HTTPS.

.github/workflows/terraform-validate.yaml

@@ -24,6 +24,7 @@ jobs:
       - name: Configure Git HTTPS for Terraform module pulls
         run: |
           git config --global url."https://oauth2:${{ steps.github_credentials.outputs.github_token }}@github.e.it.census.gov/".insteadOf "git@github.e.it.census.gov:"
+          git config --global url."https://oauth2:${{ steps.github_credentials.outputs.github_token }}@github.e.it.census.gov/".insteadOf "ssh://git@github.e.it.census.gov/"
 
       - name: Setup Terraform
         uses: CSVD/gh-actions-setup-terraform@v2