Add tech-leads as default owners (#3330)

Co-authored-by: Daniel James Smith <djsmith85@users.noreply.github.com>

.github/CODEOWNERS

@@ -2,6 +2,10 @@
 #
 # https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
 
+# The following owners will be the default owners for everything in the repo.
+# Unless a later match takes precedence
+* @bitwarden/tech-leads
+
 # DevOps for Actions and other workflow changes.
 .github/workflows @bitwarden/dept-devops