chore: bump versions to 1.2.0 #142

Job	Run time
tests	19s
cmake-integration-tests (off, ubuntu-latest)	59s
cmake-integration-tests (instrumentation, ubuntu-latest)	1m 20s
cmake-integration-tests (walltime, codspeed-macro)	2m 2s
windows-cmake-build (off)	2m 5s
windows-cmake-build (walltime)	2m 19s
bazel-integration-tests (off, ubuntu-latest)	36s
bazel-integration-tests (walltime, codspeed-macro)	1m 10s
bazel-integration-tests (instrumentation, ubuntu-latest)	1m 5s
windows-bazel-build (walltime)	1m 25s
windows-bazel-build (off)	1m 33s
	14m 53s

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