RFR: 8316851: Add @sealedGraph to Executable [v2]

[Per Minborg]

> This PR proposes to add the @sealedGraph tag to `java.lang.reflect.Executable`.

Per Minborg has updated the pull request incrementally with one additional commit since the last revision:

  Update copyright year

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15897/files
  - new: https://git.openjdk.org/jdk/pull/15897/files/6b27cf5a..e0657fbb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15897&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15897&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15897.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15897/head:pull/15897

PR: https://git.openjdk.org/jdk/pull/15897