chore: Pin dependencies and use explicit immutable installs

[kurtdoherty]

No description provided.

[rpt-uk-github]

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[kurtdoherty]

note: while yarn defaults to immutable installs in CI, we want to be explicit about it.

[kurtdoherty]

note: by default, we now opt out of all post install scripts dependencies may have.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for 3159df91	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (3159df9)	Report Missing	Report Missing	Report Missing
Head commit (95ca691)	9325	8631	92.56%

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 (#795)	0	0	∅ (not applicable)

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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Footnotes

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