chore: add pre-commit-config to renovate ignore paths (#113)

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

Author: yoshi-automation

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-bigquery-datatransfer.git",
-        "sha": "3c0cb6c1cb602c325d8d0befdb739c16a9bf23e0"
+        "sha": "34f506e81cbbbc3485a4e8a9cff87df82b3d6756"
       }
     },
     {
@@ -19,14 +19,14 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "0780323da96d5a53925fe0547757181fe76e8f1e"
+        "sha": "2c54c473779ea731128cea61a3a6c975a08a5378"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "0780323da96d5a53925fe0547757181fe76e8f1e"
+        "sha": "2c54c473779ea731128cea61a3a6c975a08a5378"
       }
     }
   ],