Bump arc-swap from 0.4.5 to 0.4.8

[dependabot]

Bumps arc-swap from 0.4.5 to 0.4.8.

Changelog

Sourced from arc-swap's changelog.

0.4.8

• Backport of fix to soundness issue in #45 (access::Map from Constant can lead to dangling references).

0.4.7

• Rename the unstable-weak to weak feature. The support is now available on 1.45 (currently in beta).

0.4.6

• Adjust to Weak::as_ptr from std (the weak pointer support, relying on unstable features).
• Support running on miri (without some optimizations), so dependencies may run miri tests.
• Little optimization when waiting out the contention on write operations.

Commits

• 34b809f Fix soundness hole around access::Map
• 77b5be7 Release 0.4.7
• 1cd19c3 Stabilized weak support
• ee8b86e Lint management
• 315f73b Version 0.4.6
• 005ec45 Merge branch 'miri'
• 8a93bb5 Update the weak ptr support for newer Rust
• 88fc681 Some trivial version updates
• e3f8538 Get rid of the model dependency
• 09cb648 Don't run pause/yield in the last iteration of wait_for_readers
• Additional commits viewable in compare view

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[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.

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