RFR: Update jextract to reflect latest API changes [v3]

[Maurizio Cimadamore]

> This patch refreshes the generated bindings to reflect the latest API changes in https://github.com/openjdk/panama-foreign/pull/787.
> 
> The changes are straightforward, and mostly consist in removing `.scope()` calls when creating upcalls, and with replacing some `SegmentScope` parameters with `Arena` ones.

Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:

  Address review comments

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Changes:
  - all: https://git.openjdk.org/jextract/pull/102/files
  - new: https://git.openjdk.org/jextract/pull/102/files/b7dac876..9ce82795

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jextract&pr=102&range=02
 - incr: https://webrevs.openjdk.org/?repo=jextract&pr=102&range=01-02

  Stats: 7 lines in 2 files changed: 2 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jextract/pull/102.diff
  Fetch: git fetch https://git.openjdk.org/jextract pull/102/head:pull/102

PR: https://git.openjdk.org/jextract/pull/102