chore: enable dependabot for pre-commit and refresh hook pins (boto#4775)

Author: jonathan343

.github/dependabot.yml

@@ -9,3 +9,9 @@ updates:
         update-types: ["version-update:semver-patch"]
     cooldown:
       default-days: 7
+  - package-ecosystem: "pre-commit"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    cooldown:
+      default-days: 7

.pre-commit-config.yaml

@@ -1,13 +1,13 @@
 exclude: ^(.github|.changes|docs/|boto3/compat.py|boto3/data|CHANGELOG.rst)
 repos:
   - repo: 'https://github.com/pre-commit/pre-commit-hooks'
-    rev: v5.0.0
+    rev: 3e8a8703264a2f4a69428a0aa4dcb512790b2c8c  # frozen: v6.0.0
     hooks:
       - id: check-yaml
       - id: end-of-file-fixer
       - id: trailing-whitespace
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.14.8
+    rev: d1b833175a5d08a925900115526febd8fe71c98e  # frozen: v0.15.11
     hooks:
       - id: ruff-check
         args: [ --fix ]