ci: Format the CHANGELOG after rendering the template (#554) #1182

Job	Run time
Lint (linux)	1m 40s
Build CLIs (linux)	4m 26s
Build CLIs (macos)	5m 36s
build_pxh	19s
Build CLIs (windows)	8m 32s
build_docs	2m 26s
format_docs	5s
Starter (linux)	2m 54s
Run macro tests (linux)	3m 56s
Example realworld (linux)	3m 10s
Tests for `pavex_session_redis` (linux)	1m 4s
Run `pavex` tests (linux)	1m 18s
Run UI tests (linux)	7m 34s
is_up_to_date	10m 15s
Run tests (linux)	52s
Tests for `pavex_session_sqlx` (linux)	1m 31s
Run `pavex` tests (macos)	2m 52s
Run tests (macos)	1m 2s
Run UI tests (macos)	7m 1s
Run UI tests (windows)	14m 3s
Run tests (windows)	3m 58s
Run `pavex` tests (windows)	5m 30s
	1h 30m 4s

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