pre-commit autoupdate --freeze (carbon-language#1241)

Mainly running this now because I should've done this for the mypy rev, but letting it update in general.

Author: jonmeow

.pre-commit-config.yaml

@@ -12,7 +12,7 @@ default_language_version:
 
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: 8fe62d14e0b4d7d845a7022c5c2c3ae41bdd3f26 # frozen: v4.1.0
+    rev: db7346d375eda68a0174f2c057dd97f2fbffe030 # frozen: v4.2.0
     hooks:
       - id: check-added-large-files
       - id: check-case-conflict
@@ -86,7 +86,7 @@ repos:
     hooks:
       - id: flake8
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: 'v0.950'
+    rev: 'a04404bdf52c2cbc9c5bd705454b89bd83b84383' # frozen: v0.950
     hooks:
       - id: mypy
         # Use setup.cfg to match the command line.