docs: show information about github rate limits when erroring due to 403

[jdx]

Fixes #2428

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.08%	✅ 54.17%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (693f39b)	19799	15454	78.05%
Head commit (36ca312)	19819 (+20)	15486 (+32)	78.14% (+0.08%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#2856)	24	13	54.17%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[powerman]

I've just hit this issue because token I've set years ago in my shell config is expired.
Probably it makes sense to mention this possible reason in error message/docs in case token is set.

[jdx]

I don't want to make assumptions about HTTP error codes. 403 is an exception because it will be extremely common.

[powerman]

You think 401 is less common? 😄

$ GITHUB_API_TOKEN=bad mise use [email protected]
mise ERROR Failed to install [email protected]
mise ERROR Failed to install with ubi 'ubi:jdx/[email protected]': HTTP status client error (401 Unauthorized) for url (https://api.github.com/repos/jdx/usage/releases/tags/v0.12.0)
mise ERROR Run with --verbose or MISE_VERBOSE=1 for more information

[jdx]

401 means they already set GITHUB_TOKEN at one point so they should be able to figure it out