RFR: JDK-8321984: IGV: Upgrade to Netbeans Platform 20 [v2]

[Tobias Holenstein]

> 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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains one additional commit since the last revision:

  JDK-8321984: IGV: Upgrade to Netbeans Platform 20

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17106/files
  - new: https://git.openjdk.org/jdk/pull/17106/files/feb25a24..b64adb13

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17106&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17106&range=00-01

  Stats: 41910 lines in 1294 files changed: 25389 ins; 10902 del; 5619 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