remove perl versions that don't seem to have good focker image #86

Job	Run time
Build on Linux with Perl 5.32	1m 13s
Build on Linux with Perl 5.30	1m 8s
Build on Linux with Perl 5.20	1m 10s
Test on 5.32	1m 50s
Native on OS ubuntu-latest Perl 5.32	1m 43s
Test on 5.30	1m 49s
Native on OS macos-latest Perl 5.32	9s
Test on 5.28	1m 51s
Native on OS windows-latest Perl 5.32	2m 4s
Test on 5.26	1m 41s
	14m 38s

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