Integrated: Update JVMLS talk links and add JVMLS 2024

[Dan Heidinga]

Update links and add JVMLS 2024 talk

-------------

Commit messages:
 - Add JVMLS 24 talk link.  Fix JVMLS 23 link

Changes: https://git.openjdk.org/leyden-docs/pull/1/files
  Webrev: https://webrevs.openjdk.org/?repo=leyden-docs&pr=1&range=00
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/leyden-docs/pull/1.diff
  Fetch: git fetch https://git.openjdk.org/leyden-docs.git pull/1/head:pull/1

PR: https://git.openjdk.org/leyden-docs/pull/1