GitHub CI: update olegtarasov/get-tag to v2.1 #770

Job	Run time
Ubuntu / 3.12 regression tests	1m 21s
check	21s
MacOS / 3.12 regression tests	1m 23s
Ubuntu / 3.8 unit tests	3s
check_docs	51s
Windows / 3.12 regression tests	1m 9s
Ubuntu / 3.9 unit tests	1s
build_docs	1m 24s
Ubuntu / 3.8 regression tests	1m 22s
Ubuntu / 3.10 unit tests	1m 13s
Ubuntu / 3.10 regression tests	1m 24s
Ubuntu / 3.11 unit tests	1m 11s
Ubuntu / 3.11 regression tests	1m 22s
Ubuntu / 3.12 unit tests	40s
Ubuntu / 3.13.0-alpha - 3.13 regression tests	1m 21s
Ubuntu / 3.13.0-alpha - 3.13 unit tests	1s
Ubuntu / pypy-3.9 regression tests	1m 22s
Ubuntu / pypy-3.9 unit tests	1s
MacOS / 3.8 unit tests	29s
Ubuntu / 3.12 regression tests (docutils)	1m 20s
MacOS / 3.9 unit tests	34s
Ubuntu / 3.12 regression tests (Sphinx)	1m 21s
MacOS / 3.10 unit tests	35s
Ubuntu / 3.9 regression tests (Sphinx)	1m 22s
MacOS / 3.11 unit tests	36s
MacOS / 3.12 unit tests	36s
MacOS / 3.13.0-alpha - 3.13 unit tests	56s
MacOS / pypy-3.9 unit tests	38s
Windows / 3.8 unit tests	1s
Windows / 3.9 unit tests	1s
Windows / 3.10 unit tests	1s
Windows / 3.11 unit tests	1s
Windows / 3.12 unit tests	1s
Windows / 3.13.0-alpha - 3.13 unit tests	1s
Windows / pypy-3.9 unit tests	1s
Ubuntu / 3.12 unit tests (Sphinx)	15s
Ubuntu / 3.9 unit tests (Sphinx)	1s
Update docs versions JSON	1s
check-tag	1s
publish-develop	1s
publish-release	1s
	25m 24s

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