fix: update prerelease branch versioning format in scheduled release workflow

[mihir20]

Description

update prerelease branch versioning format in scheduled release workflow

Linear Ticket

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.99%. Comparing base (ab887ac) to head (076240f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6745      +/-   ##
==========================================
+ Coverage   79.74%   79.99%   +0.25%     
==========================================
  Files         565      565              
  Lines       63376    63376              
==========================================
+ Hits        50539    50700     +161     
+ Misses       9846     9672     -174     
- Partials     2991     3004      +13     

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