build(deps): bump oven/bun from 1.1-slim to 1.3-slim in /Main/frontend

[dependabot]

Bumps oven/bun from 1.1-slim to 1.3-slim.

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[FlyM1ss]

Closing as part of a cleanup, not a rejection of the bump itself.

The .github/dependabot.yml that opened this PR landed in #364 without a major-version guard, and its first run raised the repo's entire accumulated update backlog at once (#365–#385). Scheduled version updates are being re-introduced deliberately in #389, which ignores semver-major and caps each ecosystem at 3 open PRs.

Nothing is lost: @dependabot reopen restores this PR. Security updates are unaffected by the new config and will continue to arrive on their own.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.