Add freeze config option for autoupdate command

This commit adds a new 'freeze' option to the CONFIG_SCHEMA, allowing users
to set 'freeze: true' in their pre-commit configuration file.

The intend are two effects, when setting `freeze: True`:
* Enables freeze automatically when running `pre-commit autoupdate` (no
  need then anymore to specify --freeze).
* Enables https://pre-commit.ci/ to freeze hooks as part of update PRs.

pre_commit/clientlib.py

@@ -466,6 +466,7 @@ CONFIG_SCHEMA = cfgv.Map(
     cfgv.Optional('files', check_string_regex, ''),
     cfgv.Optional('exclude', check_string_regex, '^$'),
     cfgv.Optional('fail_fast', cfgv.check_bool, False),
+    cfgv.Optional('freeze', cfgv.check_bool, False),
     cfgv.WarnAdditionalKeys(
         (
             'repos',
@@ -477,6 +478,7 @@ CONFIG_SCHEMA = cfgv.Map(
             'fail_fast',
             'minimum_pre_commit_version',
             'ci',
+            'freeze',
         ),
         warn_unknown_keys_root,
     ),

pre_commit/commands/autoupdate.py

@@ -176,6 +176,8 @@ def autoupdate(
         if repo['repo'] not in {LOCAL, META}
     ]
 
+    freeze = freeze or load_config(config_file)['freeze']
+
     rev_infos: list[RevInfo | None] = [None] * len(config_repos)
     jobs = jobs or xargs.cpu_count()  # 0 => number of cpus
     jobs = min(jobs, len(repos) or len(config_repos))  # max 1-per-thread