Enable merge queue for the blog repository

[Kobzol]

Requested here: rust-lang/blog.rust-lang.org#1892 (comment)

[github-actions]

Dry-run check results

[WARN  rust_team::sync] sync-team is running in dry mode, no changes will be applied.
[INFO  rust_team::sync] synchronizing crates-io
[INFO  rust_team::sync] synchronizing github
[INFO  rust_team::sync] 💻 Repo Diffs:
    📝 Editing repo 'rust-lang/blog.rust-lang.org':
      Rulesets:
          Updating 'main'
            Bypass Actors: [] => [RulesetBypassActor { actor_id: 217112, actor_type: Integration, bypass_mode: Always }]
            Merge queue grouping strategy: Allgreen
            Merge queue max entries to build: 5
            Merge queue max entries to merge: 5
            Merge queue merge_method: Merge
            Merge queue min entries to merge: 1
            Merge queue timeout: 60
            Merge queue wait time for min group size: 5
            Require merge queue: true