docs: Add upgrading guide to changelog #422

Job	Run time
Type check / Type check (3.10)	13s
Type check / Type check (3.13)	15s
Type check / Type check (3.11)	12s
Lint check / Lint check (3.12)	13s
Type check / Type check (3.12)	15s
Lint check / Lint check (3.13)	9s
Lint check / Lint check (3.10)	12s
Async dostrings check / Async docstrings check	15s
Docs check / Docs check	1m 9s
Unit tests / Unit tests (ubuntu-latest, 3.10)	28s
Unit tests / Unit tests (windows-latest, 3.13)	39s
Unit tests / Unit tests (windows-latest, 3.10)	56s
Unit tests / Unit tests (ubuntu-latest, 3.12)	37s
Unit tests / Unit tests (ubuntu-latest, 3.11)	25s
Unit tests / Unit tests (ubuntu-latest, 3.13)	27s
Unit tests / Unit tests (windows-latest, 3.12)	48s
Unit tests / Unit tests (windows-latest, 3.11)	41s
Lint check / Lint check (3.11)	10s
Integration tests / Integration tests (3.10)	29s
Integration tests / Integration tests (3.11)	30s
Integration tests / Integration tests (3.13)	34s
Integration tests / Integration tests (3.12)	32s
Integration tests / Approve integration tests for PRs from forks	-1s
Integration tests / Integration tests for PRs from forks	0s
	10m 8s

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