RFR: 8338928: Update SwingSet2 "About" image to reference openjdk.org

[Phil Race]

Update the image used when displaying SwingSet2->File->About to include up to date URLs.

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Commit messages:
 - 8338928

Changes: https://git.openjdk.org/jdk/pull/20703/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20703&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338928
  Stats: 0 lines in 1 file changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20703.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20703/head:pull/20703

PR: https://git.openjdk.org/jdk/pull/20703