Bump protobuf-java from 3.15.2 to 3.15.3
Bump protobuf-java from 3.15.2 to 3.15.3

Bumps [protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.15.2 to 3.15.3.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/protocolbuffers/protobuf/releases">protobuf-java's releases</a>.</em></p>
<blockquote>
<h2>Protocol Buffers v3.15.3</h2>
<h1>Ruby</h1>
<ul>
<li>Ruby &lt;2.7 now uses WeakMap too, which prevents memory leaks. (<a href="https://github-redirect.dependabot.com/protocolbuffers/protobuf/issues/8341">#8341</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/983d115bd9f388468fd65d1e623b858eb12bc528"><code>983d115</code></a> Update protobuf version</li>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/eb542e606b55de33df41d3868c909c73d040110b"><code>eb542e6</code></a> Updated CHANGES.txt for 3.15.3 release</li>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/80ec787928277e7b30e6bdf9e775c5618dbe8255"><code>80ec787</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/protocolbuffers/protobuf/issues/8341">#8341</a> from haberman/ruby-2.5-gc</li>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/9879f423ff9f2af8e85ce2f64ef7dc5fe6779c28"><code>9879f42</code></a> Ruby &lt;2.7now uses WeakMap too, which prevents memory leaks.</li>
<li>See full diff in <a href="https://github.com/protocolbuffers/protobuf/compare/v3.15.2...v3.15.3">compare view</a></li>
</ul>
</details>
<br />

[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=com.google.protobuf:protobuf-java&package-manager=maven&previous-version=3.15.2&new-version=3.15.3)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
- `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

</details>

Fixes #827

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/truth/pull/827 from google:dependabot/maven/com.google.protobuf-protobuf-java-3.15.3 d9f5925df2111d4f19ef0b29d2ebbe539f2d10c6
PiperOrigin-RevId: 359756279

google/truth,google/truth,google/truth