[jdk21u] RFR: 8313657: com.sun.jndi.ldap.Connection.cleanup does not close connections on SocketTimeoutErrors

[Weibing Xiao]

Please refer to the bug https://bugs.openjdk.org/browse/JDK-8313657.

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Commit messages:
 - Backport e56d3bc2dab3d32453b6eda66e8434953c436084

Changes: https://git.openjdk.org/jdk21u/pull/64/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=64&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313657
  Stats: 214 lines in 2 files changed: 205 ins; 2 del; 7 mod
  Patch: https://git.openjdk.org/jdk21u/pull/64.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/64/head:pull/64

PR: https://git.openjdk.org/jdk21u/pull/64