chore(deps): update precommit hook pre-commit/pre-commit-hooks to v3.4.0 (#48)

Co-authored-by: Tres Seaver <tseaver@palladion.com>

Source-Author: WhiteSource Renovate <bot@renovateapp.com>
Source-Date: Wed Dec 16 18:13:24 2020 +0100
Source-Repo: googleapis/synthtool
Source-Sha: aa255b15d52b6d8950cca48cfdf58f7d27a60c8a
Source-Link: googleapis/synthtool@aa255b1

Co-authored-by: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>

Author: yoshi-automation

packages/google-cloud-build/.pre-commit-config.yaml

@@ -2,7 +2,7 @@
 # See https://pre-commit.com/hooks.html for more hooks
 repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v3.3.0
+    rev: v3.4.0
     hooks:
     -   id: trailing-whitespace
     -   id: end-of-file-fixer

packages/google-cloud-build/synth.metadata

@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "f94318521f63085b9ccb43d42af89f153fb39f15"
+        "sha": "aa255b15d52b6d8950cca48cfdf58f7d27a60c8a"
       }
     }
   ],