[jdk22u] RFR: 8326351: Update the Zlib version in open/src/java.base/share/legal/zlib.md to 1.3.1

[Ravi Reddy]

Hi,

Please review the update to open/src/java.base/share/legal/zlib.md to update the file from zlib 1.3 to zlib 1.3.1 which was missed as part of the PR for [JDK-8324632](https://bugs.openjdk.org/browse/JDK-8324632)

Thanks,
Ravi

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Commit messages:
 - 8326351: Update the Zlib version in open/src/java.base/share/legal/zlib.md to 1.3.1

Changes: https://git.openjdk.org/jdk22u/pull/240/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk22u&pr=240&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326351
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk22u/pull/240.diff
  Fetch: git fetch https://git.openjdk.org/jdk22u.git pull/240/head:pull/240

PR: https://git.openjdk.org/jdk22u/pull/240