chore(e2e): Set terraform version to 1.5 until issue is addressed (#3797)

.github/workflows/enos-fmt.yml

@@ -22,6 +22,7 @@ jobs:
       - uses: hashicorp/setup-terraform@633666f66e0061ca3b725c73b2ec20cd13a8fdd1    # TSCCR: loading action configs: failed to query HEAD reference: failed to get advertised references: authorization failed
         with:
           terraform_wrapper: false
+          terraform_version: 1.5.7 # QT-623: pin to terraform 1.5.x until a tfjson bug is resolved
       - uses: hashicorp/action-setup-enos@v1    # TSCCR: loading action configs: failed to query HEAD reference: failed to get advertised references: authorization failed
         with:
           github-token: ${{ secrets.SERVICE_USER_GITHUB_TOKEN }}