Fix unknown command wrappers

Rubygems plugin loading was changed in
rubygems >= 3.2 this leads to gem-wrappers
not being loaded in a new context.

This fix registers the gem-wrappers plugin before its
being used.

See rubygems/rubygems#3108

CHANGELOG.md

@@ -16,6 +16,7 @@
 * Use libssl-1.0 to install Ree 1.8 on Ubuntu [\#4996](https://github.com/rvm/rvm/pull/4920)
 * Fix broken mergeable config [\#5001](https://github.com/rvm/rvm/pull/5001)
 * Update brew list command to remove deprecation warning [\#4995](https://github.com/rvm/rvm/pull/4995) [\#5022](https://github.com/rvm/rvm/pull/5022)
+* Fix unknown command wrappers with rubygems >= 3.2 [\#5027](https://github.com/rvm/rvm/pull/5027)
 
 #### New interpreters
 

scripts/functions/installer

@@ -1417,7 +1417,7 @@ update_gemsets_install_rvm()
             if [[ "${__gem_home}" == *"@*" ]]
             then continue
             fi
-            __rvm_with "${__gem_home##*/}" gem wrappers regenerate
+            __rvm_with "${__gem_home##*/}" (gem pristine gem-wrappers --only-plugins || true) && gem wrappers regenerate
           done
         done | __rvm_dotted "    Regenerating gem wrappers in ${#missing[@]} rubies"
       fi