Chore: Make Go 1.20 minimum required version #242

Job	Run time
Test with Codecov coverage (ubuntu-latest / 1.24)	1m 30s
Go vulnerabilities check	39s
Dependency review	9s
golangci-lint (1.24)	35s
REUSE Compliance Check	16s
Test (macos-latest / 1.20)	54s
Test (macos-latest / 1.21)	40s
Test (macos-latest / 1.22)	35s
Test (macos-latest / 1.23)	34s
Test (macos-latest / 1.24)	50s
Test (ubuntu-latest / 1.21)	44s
Test (ubuntu-latest / 1.20)	46s
Test (ubuntu-latest / 1.22)	42s
Test (ubuntu-latest / 1.23)	39s
Test (windows-latest / 1.20)	2m 13s
Test (ubuntu-latest / 1.24)	47s
Test (windows-latest / 1.22)	2m 41s
Test (windows-latest / 1.23)	2m 24s
Test (windows-latest / 1.21)	2m 22s
Test (windows-latest / 1.24)	1m 20s
Test on FreeBSD 14.1	2m 28s
Test on FreeBSD 13.4'	2m 17s
Test on FreeBSD 14.2	2m 48s
	28m 53s

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