Remove constraints unnecessary since buster

* Build-Depends: Drop versioned constraint on ruby-equalizer.

Changes-By: deb-scrub-obsolete

debian/control

@@ -9,7 +9,7 @@ Build-Depends: debhelper-compat (= 13),
                rake,
                ruby-abstract-type (>= 0.0.7),
                ruby-adamantium (>= 0.2),
-               ruby-equalizer (>= 0.0.11),
+               ruby-equalizer,
                ruby-rspec
 Standards-Version: 4.5.0
 Vcs-Git: https://salsa.debian.org/ruby-team/ruby-anima.git