chore: ignore pre-commit-config.yaml in renovate.json (#330)

* changes without context

        autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

* chore: add pre-commit-config to renovate ignore paths

Disable renovate PRs on the .pre-commit-config.yaml which is templated from synthtool. https://docs.renovatebot.com/configuration-options/#ignorepaths

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Mon Mar 15 09:05:39 2021 -0600
Source-Repo: googleapis/synthtool
Source-Sha: 2c54c473779ea731128cea61a3a6c975a08a5378
Source-Link: googleapis/synthtool@2c54c47

Co-authored-by: Christopher Wilcox <crwilcox@google.com>

.pre-commit-config.yaml

@@ -12,6 +12,6 @@ repos:
     hooks:
     - id: black
 -   repo: https://gitlab.com/pycqa/flake8
-    rev: 3.9.0
+    rev: 3.8.4
     hooks:
     - id: flake8

renovate.json

@@ -1,5 +1,6 @@
 {
   "extends": [
     "config:base",  ":preserveSemverRanges"
-  ]
+  ],
+  "ignorePaths": [".pre-commit-config.yaml"]
 }

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/python-firestore.git",
-        "sha": "8fdf2a868c66f7ebec39b190deb5d3a8a38bbc96"
+        "sha": "e57258c51e4b4aa664cc927454056412756fc7ac"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "ac8f20f12e7a4c0b0ae1c6fa415f684a25ea82b7"
+        "sha": "2c54c473779ea731128cea61a3a6c975a08a5378"
       }
     }
   ],