MAINT: Simplify file identifiers generation #4116

Job	Run time
Check code style issues	25s
pytest on windows	4m 35s
Build & verify package	13s
pytest on 3.7 (crypto-lib: cryptography)	3m 30s
pytest on 3.8 (crypto-lib: cryptography)	3m 40s
pytest on 3.9 (crypto-lib: cryptography)	3m 39s
pytest on 3.10 (crypto-lib: cryptography)	3m 50s
pytest on 3.11 (crypto-lib: cryptography)	3m 32s
pytest on 3.12 (crypto-lib: cryptography)	4m 45s
pytest on 3.6 (crypto-lib: pycryptodome)	3m 51s
pytest on 3.7 (crypto-lib: none)	3m 34s
Combine & check coverage.	17s
	35m 51s

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