Bump actions/download-artifact from 3 to 4 #194

Job	Run time
Build distribution	1m 34s
coverage-job	37s
Perl 5.8 on ubuntu-20.04	4s
Perl 5.10 on ubuntu-20.04	4s
Perl 5.12 on ubuntu-20.04	6s
Perl 5.14 on ubuntu-20.04	7s
Perl 5.16 on ubuntu-20.04	4s
Perl 5.18 on ubuntu-20.04	6s
Perl 5.20 on ubuntu-20.04	7s
Perl 5.22 on ubuntu-20.04	4s
Perl 5.24 on ubuntu-20.04	3s
Perl 5.26 on ubuntu-20.04	3s
Perl 5.28 on ubuntu-20.04	4s
Perl 5.30 on ubuntu-20.04	4s
Perl 5.32 on ubuntu-20.04	6s
Perl 5.34 on ubuntu-20.04	6s
Perl 5.36 on ubuntu-20.04	6s
Perl 5.38 on ubuntu-20.04	5s
perl ${{ matrix.perl-version }} on windows-latest	0s
perl ${{ matrix.perl-version }} on macos-latest	0s
	3m 30s

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