DEV: Fix changelog generator regarding whitespace and handling of "Other" group #4384

Job	Run time
Build & verify package	14s
Check code style issues	38s
pytest on windows	4m 55s
pytest on 3.7 (crypto-lib: cryptography)	3m 33s
pytest on 3.8 (crypto-lib: cryptography)	4m 1s
pytest on 3.9 (crypto-lib: cryptography)	3m 36s
pytest on 3.10 (crypto-lib: cryptography)	3m 35s
pytest on 3.11 (crypto-lib: cryptography)	3m 25s
pytest on 3.12 (crypto-lib: cryptography)	4m 39s
pytest on 3.7 (crypto-lib: pycryptodome)	3m 41s
pytest on 3.7 (crypto-lib: none)	3m 51s
Combine & check coverage.	19s
	36m 27s

Provide feedback