build: use 8xlarge as arm default

[evenyag]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

The arm64 release job is easily killed by OOM. Changing the release.yml in the branch doesn't work.
https://github.com/GreptimeTeam/greptimedb/actions/runs/12433239151/job/34714534156

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.86%. Comparing base (8ece853) to head (6194f73).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5214      +/-   ##
==========================================
- Coverage   84.08%   83.86%   -0.23%     
==========================================
  Files        1184     1184              
  Lines      219872   219872              
==========================================
- Hits       184882   184389     -493     
- Misses      34990    35483     +493