fix using Term on nightly - julia 1.12

[t-bltg]

Fix #246, and fix testsuite on v"1.6" ≤ VERSION ≤ v"1.12".
Fix #237, by skipping writing files on CI or PKGEVAL.

Also,

• add stdlib [compat] bounds per this PSA;
• restore CI on master: this branch should always be tested !;
• cancel builds in progress on a PR to spare CI credits;
• update CI jobs, test nightly and upcoming 1.11.

@FedeClaudi, a version bump after this merge would be appreciated in order to re-enable NanoSoldier - PkgEval checks.

Needed in order to allow UnicodePlots testsuite to run on nightly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.27%. Comparing base (a9e1af3) to head (440ce2c).
Report is 28 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #245      +/-   ##
==========================================
- Coverage   87.29%   87.27%   -0.03%     
==========================================
  Files          48       48              
  Lines        2873     2899      +26     
==========================================
+ Hits         2508     2530      +22     
- Misses        365      369       +4     

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[t-bltg]

@FedeClaudi, bump ?

Would it make sense to add myself as a editor of this repo so that I can merge pull requests (mostly maintenance such as this one) ?

[FedeClaudi]

Hey, sure let me add you to the repo!

[t-bltg]

Thanks !

Any objection for merging this PR ?