disable fail-fast on GHA CI

[oxinabox]

Fail-fast on GHA doesn't work great.
The benchmark job erroring shouldn't prevent the actual testing jobs from running.
Since the benchmarking job can error if you change how any types are defined #327 (comment)

[codecov-io]

Codecov Report

Merging #328 (5808d45) into master (906cea0) will decrease coverage by 0.20%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #328      +/-   ##
==========================================
- Coverage   93.80%   93.59%   -0.21%     
==========================================
  Files          32       32              
  Lines        1534     1531       -3     
==========================================
- Hits         1439     1433       -6     
- Misses         95       98       +3     

Impacted Files	Coverage Δ
src/compat.jl	0.00% <0.00%> (-100.00%)	⬇️
src/types/zoneddatetime.jl	96.00% <0.00%> (-0.06%)	⬇️
src/parse.jl	94.44% <0.00%> (-0.02%)	⬇️
src/tzdata/compile.jl	95.50% <0.00%> (+0.32%)	⬆️

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[omus]

Are you sure fast-fail works this way? Seems strange that it looks at jobs that aren't part of it's on matrix

[oxinabox]

No, I am not sure.

[omus]

When set to true, GitHub cancels all in-progress jobs if any matrix job fails. Default: true
https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjob_idstrategyfail-fast

Seems like this documentation is wrong then. Would be good to open an issue.

[omus]

So the solution to this is to actually set fast-fail: false on just the benchmark job. With this then a failure from the benchmark job will not impact any other running job but jobs with fast-fail: true will cause other jobs to be cancelled. I'll make a PR for this.