[crac] RFR: Update the "modified criu" link to the latest release

[Pushkar N Kulkarni]

The modified criu binary downloaded from the release that is linked from the README causes CRaC to segfault while checkpointing. Updating to the latest release helps resolve the problem.

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Commit messages:
 - Update the "modified criu" link to the latest release

Changes: https://git.openjdk.org/crac/pull/126/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=126&range=00
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/crac/pull/126.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/126/head:pull/126

PR: https://git.openjdk.org/crac/pull/126