dev: document missing git tags failure mode #2064

Job	Run time
Build & verify package	15s
Check types using supported type checkers	22s
Verify dev env	10s
Tests on pypy-3.10	18s
Run doctests & render changelog	19s
Tests & Mypy on 3.14	1m 6s
Tests & Mypy on 3.12	1m 13s
Tests & Mypy on 3.11	59s
Tests & Mypy on 3.9	38s
Tests & Mypy on 3.10	1m 11s
Tests & Mypy on 3.13	1m 4s
Combine & check coverage	12s
required-checks-pass	4s
	7m 51s

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