tls: add --tls-min-v1.2 CLI switch
Switch added in v11.x, add it to master/12.x for consistency and compatibility.
See: https://github.com/nodejs/node/pull/26951, commit bf2c2835
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines