Update to glean-parser 8.1 and allow any patch version

[badboy]

I copied the script from https://github.com/mozilla/glean/blob/3c1c083238876dd6cc4e7577c66b73d309ab83d8/gradle-plugin/src/main/groovy/mozilla/telemetry/glean-gradle-plugin/GleanGradlePlugin.groovy#L61

This now uses ~= for the glean-parser install, so we don't need to update glean.js for every glean_parser patch update.

[badboy]

Probably needs a fix to bin/update-glean-parser-version.sh to only set the MAJOR.MINOR version correctly.

What to test:

• Does it pick glean_parser 8.1.1 correctly on a clean source?
• Manually install glean_parser 8.1.0 -- does it work?

[rosahbruno]

@badboy

Probably needs a fix to bin/update-glean-parser-version.sh to only set the MAJOR.MINOR version correctly.

It looks like this command only updates two spots

1. cli.ts - it will set whatever you pass in. If we run the script with version 8.0, it will set the value of GLEAN_PARSER_VERSION to 8.0
2. qt/requirements.txt - we are not currently supporting any projects on QT and plan to likely decommission support, so likely not worth extra work there to deal with this

What to test:

* Does it pick glean_parser 8.1.1 correctly on a clean source?

* Manually install glean_parser 8.1.0 -- does it work?

I was able to git clean my repo and run and it picked up 8.1.1. I then manually pulled in 8.1.0 and it seemed to work correctly too.

[rosahbruno]

Actually, before we merge. I think we should update these docs to specify that running this command should only use <MAJOR>.<MINOR> now.

https://github.com/mozilla/glean.js/blob/main/docs/guides/update_glean_parser.md?plain=1#L6