build(java): enable snippet-bot (#311)

This PR was generated using Autosynth. 🌈 Synth log will be available here: https://source.cloud.google.com/results/invocations/44e19739-17d8-49c5-8c3f-c99d2a4544ec/targets - [ ] To automatically regenerate this PR, check this box. Source-Link: googleapis/synthtool@5a506ec

Author: yoshi-automation

.github/snippet-bot.yml

@@ -4,7 +4,7 @@
  "git": {
  "name": ".",
  "remote": "https://github.com/googleapis/java-trace.git",
- "sha": "95012e538a7cc1bd9d1373a2c8264dd545023f8d"
+ "sha": "7d7fe56390df4199726da58cd9e8bbbc08385174"
  }
  },
  {
@@ -27,7 +27,7 @@
  "git": {
  "name": "synthtool",
  "remote": "https://github.com/googleapis/synthtool.git",
- "sha": "7c5370937dd9ba9dcf9cd7d2af880a58b389b4f1"
+ "sha": "5a506ec8765cc04f7e29f888b8e9b257d9a7ae11"
  }
  }
  ],
@@ -59,6 +59,7 @@
  ".github/PULL_REQUEST_TEMPLATE.md",
  ".github/readme/synth.py",
  ".github/release-please.yml",
+ ".github/snippet-bot.yml",
  ".github/trusted-contribution.yml",
  ".github/workflows/approve-readme.yaml",
  ".github/workflows/auto-release.yaml",