2009: bump version number to 1.2.1

[cz4rs]

Make sure that the version number on develop and on main is in sync.

fixes #2009

[github-actions]

Pipelines results

PR tests (gcc-5, ubuntu, mpich)

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PR tests (gcc-9, ubuntu, mpich, zoltan)

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PR tests (clang-3.9, ubuntu, mpich)

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PR tests (gcc-7, ubuntu, mpich, trace runtime, LB)

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PR tests (gcc-10, ubuntu, openmpi, no LB)

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PR tests (gcc-6, ubuntu, mpich)

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PR tests (clang-5.0, ubuntu, mpich)

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PR tests (clang-9, ubuntu, mpich)

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PR tests (clang-13, alpine, mpich)

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PR tests (gcc-8, ubuntu, mpich, address sanitizer)

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PR tests (intel icpx, ubuntu, mpich)

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PR tests (clang-11, ubuntu, mpich)

Build for 1ea4a80 (2022-11-08 19:44:31 UTC)

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PR tests (clang-12, ubuntu, mpich)

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PR tests (clang-13, ubuntu, mpich)

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PR tests (clang-14, ubuntu, mpich)

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PR tests (clang-10, ubuntu, mpich)

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PR tests (gcc-11, ubuntu, mpich, json schema test)

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PR tests (nvidia cuda 11.0, ubuntu, mpich)

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PR tests (gcc-12, ubuntu, mpich)

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PR tests (intel icpc, ubuntu, mpich)

Build for 4754ca4 (2022-11-10 00:08:35 UTC)

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PR tests (nvidia cuda 10.1, ubuntu, mpich)

Build for 4754ca4 (2022-11-10 00:08:35 UTC)

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[codecov]

Codecov Report

Merging #2011 (4754ca4) into develop (fa55c93) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #2011   +/-   ##
========================================
  Coverage    84.50%   84.50%           
========================================
  Files          731      731           
  Lines        25860    25860           
========================================
  Hits         21852    21852           
  Misses        4008     4008           

Impacted Files	Coverage Δ
src/vt/phase/phase_manager.cc	91.21% <0.00%> (ø)