[PM-14367] Update default base_version_number in build.yml

[vvolkgang]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-14367

📔 Objective

Matching the base version number of CI-main.yml, making it easier to trigger manual builds following the same number sequence.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (main@15e1e8e). Learn more about missing BASE report.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1098   +/-   ##
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  Coverage        ?   89.34%           
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  Files           ?      677           
  Lines           ?    42763           
  Branches        ?        0           
=======================================
  Hits            ?    38207           
  Misses          ?     4556           
  Partials        ?        0           

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