Bump re2j from 1.5 to 1.6

Bumps [re2j](https://github.com/google/re2j) from 1.5 to 1.6.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/google/re2j/commit/34f304131afe67bf79242513c2a31888514b8800"><code>34f3041</code></a> Add benchmark for matching utf8 bytes</li>
<li><a href="https://github.com/google/re2j/commit/c4e81202bed3010e0b6217e39040ec4699bed5cf"><code>c4e8120</code></a> Support matching binary utf8 string</li>
<li><a href="https://github.com/google/re2j/commit/2986a5d2b00886859dcde017cb2a95d747c5fa95"><code>2986a5d</code></a> Expose named groups from Pattern</li>
<li><a href="https://github.com/google/re2j/commit/b7d35310742b0fefac686becfb242d01a7e48edd"><code>b7d3531</code></a> skip existing headers in license check</li>
<li>See full diff in <a href="https://github.com/google/re2j/compare/re2j-1.5...re2j-1.6">compare view</a></li>
</ul>
</details>
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Fixes #836

COPYBARA_INTEGRATE_REVIEW=#836 from google:dependabot/maven/com.google.re2j-re2j-1.6 7caa38f
PiperOrigin-RevId: 361860532

pom.xml

@@ -135,7 +135,7 @@
       <dependency>
         <groupId>com.google.re2j</groupId>
         <artifactId>re2j</artifactId>
-        <version>1.5</version>
+        <version>1.6</version>
       </dependency>
       <dependency>
         <groupId>org.ow2.asm</groupId>