Improve filename sanitization in MIME headers #141

Job	Run time
Test with Codecov coverage (ubuntu-latest / 1.23)	1m 3s
Go vulnerabilities check	17s
golangci-lint (1.23)	36s
Dependency review	13s
REUSE Compliance Check	17s
Test with SonarQube review (ubuntu-latest / 1.23)	1m 24s
Test on FreeBSD 13.4'	2m 16s
Test on FreeBSD 14.0	2m 9s
Test on FreeBSD 14.1	2m 18s
Test (macos-latest / 1.19)	53s
Test (macos-latest / 1.20)	33s
Test (macos-latest / 1.22)	25s
Test (macos-latest / 1.21)	27s
Test (macos-latest / 1.23)	27s
Test (ubuntu-latest / 1.19)	30s
Test (ubuntu-latest / 1.20)	29s
Test (ubuntu-latest / 1.21)	23s
Test (ubuntu-latest / 1.22)	29s
Test (ubuntu-latest / 1.23)	31s
Test (windows-latest / 1.19)	1m 8s
Test (windows-latest / 1.20)	3m 46s
Test (windows-latest / 1.21)	2m 34s
Test (windows-latest / 1.22)	3m 37s
Test (windows-latest / 1.23)	5m 4s
	31m 49s

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