chore(projects): remove needless require calls

These require calls were for with-eval-after-load expressions, but
there's no need to require the relevant modules.

modules/projects/siren-treemacs.el

@@ -6,11 +6,6 @@
 
 ;;; Code:
 
-(require 'siren-lsp)
-(require 'siren-magit)
-(require 'siren-persp-mode)
-(require 'siren-projectile)
-
 (use-package treemacs
   :bind
   ("C-x C-p" . treemacs)