* Fix analyzer rules with Xcode 13.3
Looks like starting with Xcode 13.3 / Swift 5.6, cursor info requests
started canceling in-flight requests, so we need to pass
`key.cancel_on_subsequent_request: false` to bypass that.
Analyzer rules on Swift 5.6 are extremely slow, however. Not really
usable right now.
* Run analyzer rules one file at a time
* Add changelog entry
JP Simard