feat!: Change updater pr-strategy default to 'update'

[vaind]

Summary

Changes the default value for the pr-strategy input parameter from create to update in the updater composite action.

Breaking Change

• Previous behavior: Created separate PRs for each dependency version update
• New behavior: Maintains a single PR that gets updated with the latest dependency version

Migration

Users who want to preserve the previous behavior must explicitly set pr-strategy: create:

- uses: getsentry/github-workflows/updater@v3
  with:
    path: path/to/dependency
    name: Dependency Name
    pr-strategy: create  # Explicitly preserve previous behavior
    api-token: ${{ secrets.GITHUB_TOKEN }}

Files Changed

• updater/action.yml: Changed default value from 'create' to 'update'
• updater/README.md: Updated documentation to reflect new default
• CHANGELOG.md: Added breaking change entry with migration instructions

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