chore(lang): remove rbenv.el from ruby setup

I never used it, and doom-modeline does an excellent job of showing
active Ruby version, among other languages

modules/languages/siren-ruby.el

@@ -108,11 +108,6 @@
   (unbind-key "C-c C-r" inf-ruby-minor-mode-map)
   (unbind-key "C-c C-s" inf-ruby-minor-mode-map))
 
-(use-package rbenv
-  :defer t
-  :config
-  (global-rbenv-mode))
-
 (use-package rspec-mode
   :defer t
   :hook (rspec-mode . siren-rspec-mode-setup)

straight/versions/default.el

@@ -141,7 +141,6 @@
  ("prettier-emacs" . "e9b73e81d3e1642aec682195f127a42dfb0b5774")
  ("projectile" . "7b6ac286120421216faae43f9e234d801a30ee3d")
  ("rainbow-mode" . "fdff98b12e62df7a6dbb009321430c90a47bb89b")
- ("rbenv.el" . "2ea1a5bdc1266caef1dd77700f2c8f42429b03f1")
  ("recursive-narrow" . "5e3e2067d5a148d7e64e64e0355d3b6860e4c259")
  ("reformatter.el" . "45c0add95025f53ca644a6c8b9afa05b2da3c474")
  ("resize-window" . "72018aa4d2401b60120588199d4cedd0dc1fbcfb")