Remove feature-freeze from gh templates (#15698)

ping rust-lang/rust-clippy#15690

changelog: none

Author: samueltardieu

.github/ISSUE_TEMPLATE/new_lint.yml

@@ -1,7 +1,5 @@
 name: New lint suggestion
-description: |
-  Suggest a new Clippy lint (currently not accepting new lints)
-  Check out the Clippy book for more information about the feature freeze.
+description: Suggest a new Clippy lint.
 labels: ["A-lint"]
 body:
   - type: markdown

.github/PULL_REQUEST_TEMPLATE.md

@@ -32,10 +32,6 @@ order to get feedback.
 
 Delete this line and everything above before opening your PR.
 
-Note that we are currently not taking in new PRs that add new lints. We are in a
-feature freeze. Check out the book for more information. If you open a
-feature-adding pull request, its review will be delayed.
-
 ---
 
 *Please write a short comment explaining your change (or "none" for internal only changes)*