Merge pull request #4083 from agilgur5/remove-dated-microbundle-rpt2-ignores

clean: remove outdated `microbundle` cache directories

Author: wirecat

Node.gitignore

@@ -57,12 +57,6 @@ web_modules/
 # Optional stylelint cache
 .stylelintcache
 
-# Microbundle cache
-.rpt2_cache/
-.rts2_cache_cjs/
-.rts2_cache_es/
-.rts2_cache_umd/
-
 # Optional REPL history
 .node_repl_history