RFR: JDK-8321984: IGV: Upgrade to Netbeans Platform 20 [v6]

Mon Jan 22 11:34:38 UTC 2024

> Upgraded IGV and dependencies to the newest Netbeans Platform 20 which was released on December 2023.
> 
> Tested that IGV still behaves as expected after the upgrade.

Tobias Holenstein has updated the pull request incrementally with one additional commit since the last revision:

  Revert "make IGV build work with mainline JDK version"

  This reverts commit 35080de727135741fee96834470072f002c32501.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17106/files
  - new: https://git.openjdk.org/jdk/pull/17106/files/218ab753..273c9652

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17106&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17106&range=04-05

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17106.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17106/head:pull/17106

PR: https://git.openjdk.org/jdk/pull/17106