[jdk7u] RFR: 8285579: Bump update version of OpenJDK: 7u351

[Andrew Brygin]

Bump the version in .jcheck/conf to openjdk7u351.

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Commit messages:
 - 8285579: Bump update version of OpenJDK: 7u351

Changes: https://git.openjdk.java.net/jdk7u/pull/2/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk7u&pr=2&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8285579
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk7u/pull/2.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk7u pull/2/head:pull/2

PR: https://git.openjdk.java.net/jdk7u/pull/2