RFR: 8304283: Modernize the switch statements in jdk.internal.foreign

[Per Minborg]

This PR proposes changing old-type switch statements to newer forms of switch.

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Commit messages:
 - Update copyright years
 - Modernize the switch statements in jdk.internal.foreign

Changes: https://git.openjdk.org/jdk/pull/13047/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13047&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304283
  Stats: 214 lines in 8 files changed: 23 ins; 96 del; 95 mod
  Patch: https://git.openjdk.org/jdk/pull/13047.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/13047/head:pull/13047

PR: https://git.openjdk.org/jdk/pull/13047