Improve filename sanitization in MIME headers #144

Job	Run time
Test with Codecov coverage (ubuntu-latest / 1.23)	58s
Dependency review	12s
Go vulnerabilities check	18s
golangci-lint (1.23)	39s
REUSE Compliance Check	23s
Test with SonarQube review (ubuntu-latest / 1.23)	1m 35s
Test (macos-latest / 1.19)	39s
Test (macos-latest / 1.20)	38s
Test (macos-latest / 1.21)	24s
Test (macos-latest / 1.22)	27s
Test (ubuntu-latest / 1.19)	34s
Test (ubuntu-latest / 1.20)	44s
Test (macos-latest / 1.23)	28s
Test (ubuntu-latest / 1.21)	35s
Test (ubuntu-latest / 1.22)	28s
Test (ubuntu-latest / 1.23)	26s
Test (windows-latest / 1.19)	1m 6s
Test (windows-latest / 1.20)	1m 55s
Test (windows-latest / 1.21)	1m 10s
Test (windows-latest / 1.22)	1m 8s
Test on FreeBSD 13.4'	2m 8s
Test on FreeBSD 14.0	2m 10s
Test (windows-latest / 1.23)	54s
Test on FreeBSD 14.1	2m 11s
	22m 10s

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