[DRE-maint] Bug#1036126: New packages should set minimum version of gem2deb as 2.1~

[Praveen Arimbrathodiyil]

Package: gem2deb
Version: 2.1
Severity: important

When building for bullseye-backports it fails

    dh_ruby --clean
No XS-Ruby-Versions: field found in source!
dh_auto_clean: error: dh_ruby --clean returned exit code 1
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