RFR: 8278: Update COPYRIGHT, LICENSE.txt and THIRDPARTYREADME.txt files

[Virag Purnam]

Updated COPYRIGHT, LICENSE.txt and THIRDPARTYREADME.txt files. 

- Many third-party libraries have been upgraded.
- Copyright years are not the current year.

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Commit messages:
 - 8278: Update COPYRIGHT, LICENSE.txt and THIRDPARTYREADME.txt files

Changes: https://git.openjdk.org/jmc/pull/605/files
  Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=605&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8278
  Stats: 8813 lines in 3 files changed: 1643 ins; 6248 del; 922 mod
  Patch: https://git.openjdk.org/jmc/pull/605.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/605/head:pull/605

PR: https://git.openjdk.org/jmc/pull/605