Make clojure-ts-mode dependency optional

Tests will fail when using Emacs versions less than 29 because
clojure-ts-mode requires Emacs 29 to work properly. That could be why
tests fail in CI. This probably won't help with the linting issue

Author: dannyfreeman

Eldev

@@ -10,7 +10,7 @@
 
 (eldev-add-loading-roots 'test "test/utils")
 (eldev-add-extra-dependencies 'runtime '(:package logview :optional t))
-(eldev-add-extra-dependencies 'runtime '(:package clojure-ts-mode))
+(eldev-add-extra-dependencies 'runtime '(:package clojure-ts-mode :optional t))
 
 (defvar cider-test-type 'main)
 (setf eldev-standard-excludes `(:or ,eldev-standard-excludes