The `subject_length` for committed is too small

[Muscraft]

I constantly find myself running into problems with the current subject_length of 50, which causes me to spend extra time trying to fit my commit messages within the limit. The process of cutting my commit messages down usually involves omitting words, leading to grammatically incorrect messages that are often still over the line, examples:

57 char | test: Overflow when whitespace annotated small term width
57 char | fix: Show full line when patch span is points to line end
55 char | test: Add test for suggestion span equaling EOL and EOF
53 char | test: Improve clarity of sugg span bigger that source

Part of the problem stems from the terminology of annotate-snippets. Words like suggestion, whitespace, annotate, calculate, display, etc., are all relatively long; usually, more than one is needed. All of this leads to a bad experience where even after trying to cut the commit message down, 20% of Lint Commit jobs still fail.

To improve the contribution experience, I would like to raise the subject_length to at least 60, preferably 72. Using 72 would fit the 95th percential of subject length[^1] for the few repos I tested:

Repo	95th% subject lengeth
rust-lang/annotate-snippets-rs	58.0
rust-lang/rust	76.0
rust-lang/cargo	70.0
Linux kernel (last three years)	76.0

[^1]: Command for getting quantiles git log --no-merges --pretty='%s' | python3 -c 'import statistics,sys; print(statistics.quantiles([len(l) for l in sys.stdin], n=20))'