[jfx11u] RFR: 8263760: Update gradle to version 7.0.1 [v2]

[Ambarish Rapte]

> There were two minor merge conflicts in `build.gradle` and one conflict in `gradle/wrapper/gradle-wrapper.properties` while cherry picking the change. 
> And it also required similar changes to be made for project fxpackager. The [first commit](https://github.com/openjdk/jfx11u/pull/49/commits/7700a6d1a7c82df8fc269f1de6f3bd5119fb3397) is the original cherry pick and [second commit](https://github.com/openjdk/jfx11u/pull/49/commits/cea09bdfc96374ce00560c13e6730ab76f8b20e9) is the additional changes for fxpackager.
> Verified the build on all three platforms with gradle 7.0.1 and apache ant 1.10.5

Ambarish Rapte has updated the pull request incrementally with one additional commit since the last revision:

  use antpluginImplementation

-------------

Changes:
  - all: https://git.openjdk.java.net/jfx11u/pull/49/files
  - new: https://git.openjdk.java.net/jfx11u/pull/49/files/cea09bdf..1dc05179

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=49&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=49&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx11u/pull/49.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/49/head:pull/49

PR: https://git.openjdk.java.net/jfx11u/pull/49