Fix Cloudflare WAF rule updates

[nick-csu]

Summary

• use Cloudflare’s current PATCH method for updating an existing Rulesets API rule
• prevent successful demo deployments from being marked failed during final WAF reconciliation

Verification

• quality, coverage, package, browser, and static-browser suites passed in PR Fix Cloudflare WAF rule updates #47
• the previous demo upload and concurrent production check passed; the obsolete update method was the only failed step