Avoid using sed, use --slurp instead

Author: aeisenberg

CONTRIBUTING.md

@@ -72,7 +72,7 @@ Here are a few things you can do that will increase the likelihood of your pull
 
     Approve the mergeback PR and automerge it. Once the mergeback has been merged into main, the release is complete.
 
-## Keeping the PR checks up to date (requires admin access)
+## Keeping the PR checks up to date (admin access required)
 
 Since the `codeql-action` runs most of its testing through individual Actions workflows, there are over two hundred jobs that need to pass in order for a PR to turn green. Managing these PR checks manually is time consuming and complex. Here is a semi-automated approach.
 
@@ -82,8 +82,7 @@ To regenerate the PR jobs for the action:
 
     ```sh
     SHA= ####
-    CHECKS="$(gh api repos/github/codeql-action/commits/${SHA}/check-runs --paginate | jq --compact-output --raw-output '[.["check_runs"] | .[].name | select(contains("https://") or . == "CodeQL" or . == "LGTM.com" or . == "Update dependencies" | not)]')"
-    CHECKS="$(echo $CHECKS  | sed -E 's|\].*\[|,|g')" # Because the gh command is paginated, the results are multiple arrays
+    CHECKS="$(gh api repos/github/codeql-action/commits/${SHA}/check-runs --paginate | jq --slurp --compact-output --raw-output '[.[].check_runs | .[].name | select(contains("https://") or . == "CodeQL" or . == "LGTM.com" or . == "Update dependencies" | not)]')"
     echo "{\"contexts\": ${CHECKS}}" > checks.json
     gh api -X "PATCH" repos/github/codeql-action/branches/main/protection/required_status_checks --input checks.json
     gh api -X "PATCH" repos/github/codeql-action/branches/v1/protection/required_status_checks --input checks.json