bottle: add tests for json merging

- Extract the json reading from the json merging: it makes the code hard to understand.
This helps for the separation of concerns: the jsons are read in one method;
and merged in a second one
- Added a first test to check the merge function

No change in behaviour was done, this change is just there to increase code coverage
and to prepare for #9315

software_spec: make bottle sorting stable.

cmd/update: improve shallow clone message.

dev-cmd/dispatch-build-bottle: remove testing code.

As `:arm64_big_sur` and `:big_sur` equated to the same version: their
sorting was not consistent. Instead, suffix the tag and use that for
sorting so `:big_sur` is always before `:arm64_big_sur`.

build(deps-dev): bump html-proofer from 3.17.3 to 3.17.4 in /docs

build(deps): bump sorbet from 0.5.6130 to 0.5.6134 in /Library/Homebrew

diagnostic: don't complain about creatable directories that don't exist.

This was accidentally merged in https://github.com/Homebrew/brew/pull/9444.

Bumps [sorbet](https://github.com/sorbet/sorbet) from 0.5.6130 to 0.5.6134.
- [Release notes](https://github.com/sorbet/sorbet/releases)
- [Commits](https://github.com/sorbet/sorbet/commits

)

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.17.3 to 3.17.4.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.17.3...v3.17.4

)

Signed-off-by: dependabot[bot] <support@github.com>

If you can write to `HOMEBREW_PREFIX` (which isn't the case for
`/usr/local` on newer macOSs) then don't complain about these
directories not existing.

dev-cmd/dispatch-build-bottle: set ARM labels.

Set the label properly for ARM.

Tested with inputs `11-arm` and `arm64_big_sur`.

Fixes https://github.com/Homebrew/brew/issues/9434

Fix `:arm64_big_sur` bottle ordering.

brew.sh: don't allow system Ruby on Catalina.

livecheck: add GithubLatest strategy

This wasn't being parsed correctly so was being put below the Linux
bottle which is less readable, less intuitive and will cause a bunch
of merge conflicts.

It's (far) too broken for our purposes.

Fixes https://github.com/Homebrew/brew/issues/9410

workflows/tests: consolidate macOS tests.

git_extensions: refactor and delete redundant functions

Merge pull request #9431 from RandomDSdevel/restore-semantically-significant-indentation-lost-accidentally-in-PR-9398

[Library/Homebrew/cli/named_args.rb] `to_formulae_to_casks()`:  Reasssociate its `rescue` Block with the Correct Enclosing Scope

`rescue` block with the right enclosing scope.

     PR #9398 accidentally removed some semantically significant indentation in
this function, thus inadvertently kicking the `rescue` block inside out to func-
tion scope, when it moved its code further up in the file.  This may well not
confuse a Ruby interpreter, but it could trip human readers up.  Compensate and
correct the overlooked offending oversight and potential refactoring mistake by
restoring only that indentation, leaving the function in its new location.

Refs #9398.

brew: re-exec under native arch if requested