RFR: 1216: Update to JDK 17 and Gradle 7.2 [v2]

[Erik Joelsson]

> This patch bumps the required JDK version to build and run Skara to JDK 17 and the version of Gradle to 7.2. I'm also eliminating some redundant declarations of where to download the JDK binaries so that it's all defined in deps.env.

Erik Joelsson has updated the pull request incrementally with one additional commit since the last revision:

  Update gradle wrapper

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Changes:
  - all: https://git.openjdk.java.net/skara/pull/1235/files
  - new: https://git.openjdk.java.net/skara/pull/1235/files/6b4eda61..9a9279d4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=skara&pr=1235&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=skara&pr=1235&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/1235.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1235/head:pull/1235

PR: https://git.openjdk.java.net/skara/pull/1235