docs: add upgrading to v0.4 section (#642) #30

Job	Run time
Prepare release metadata	0s
Lint check / Lint check (3.9)	54s
Type check / Type check (3.9)	57s
Lint check / Lint check (3.10)	44s
Unit tests / Unit tests (ubuntu-latest, 3.9)	2m 29s
Type check / Type check (3.10)	57s
Lint check / Lint check (3.11)	39s
Unit tests / Unit tests (ubuntu-latest, 3.10)	2m 32s
Type check / Type check (3.11)	57s
Lint check / Lint check (3.12)	38s
Unit tests / Unit tests (ubuntu-latest, 3.11)	2m 30s
Type check / Type check (3.12)	55s
Unit tests / Unit tests (ubuntu-latest, 3.12)	2m 40s
Unit tests / Unit tests (windows-latest, 3.9)	3m 56s
Unit tests / Unit tests (windows-latest, 3.10)	4m 4s
Unit tests / Unit tests (windows-latest, 3.11)	4m 24s
Unit tests / Unit tests (windows-latest, 3.12)	5m 12s
Update changelog	0s
Publish to PyPI	0s
	34m 28s

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