chore: update gitignore list (#9437)

Updated the gitignore list with the command : `go run scripts/generate-gitignores.go`

options/gitignore/Erlang

@@ -1,10 +1,17 @@
 .eunit
-deps
 *.o
 *.beam
 *.plt
 erl_crash.dump
-ebin/*.beam
-rel/example_project
 .concrete/DEV_MODE
+
+# rebar 2.x
 .rebar
+rel/example_project
+ebin/*.beam
+deps
+
+# rebar 3
+.rebar3
+_build/
+_checkouts/