RFR: 8374361: Update copyright year to 2025 for jdk.hotspot.agent in files where it was missed

[Sergey Bylokhov]

The copyright year in "jdk.hotspot.agent" files updated in 2025 has been bumped to 2025.

The next command can be run (on top of this PR) to verify that each file had prior commits in 2025:

`git diff HEAD~1 --name-only | while read f; do git log HEAD~1 --since="2025-01-01" --oneline -- "$f" | head -1 | grep -q . || echo "NOT IN 2025: $f"; done`

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Commit messages:
 - 8374361: Update copyright year to 2025 for jdk.hotspot.agent in files where it was missed

Changes: https://git.openjdk.org/jdk/pull/28994/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28994&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374361
  Stats: 18 lines in 18 files changed: 0 ins; 0 del; 18 mod
  Patch: https://git.openjdk.org/jdk/pull/28994.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28994/head:pull/28994

PR: https://git.openjdk.org/jdk/pull/28994