Update Rust crate slog to v2.8.1

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
slog	workspace.dependencies	patch	2.8.0 -> 2.8.1

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Release Notes

slog-rs/slog (slog)

v2.8.1

Compare Source

This fixes an accidental breaking change in the v2.8.0 release,
where the public API was changed from erased_serde v0.4 to erased_serde v0.3.
This should not affect normal users of the API but could break drains supporting nested-values.

I (@​Techcable) apologize for this breakage and have yanked the 2.8.0 release due to this issue. I will try to setup cargo-semver-checks in the CI to avoid this in the future.

Fixed

• Restore compatibility with erased-serde version 0.3.
  • Compatibility with erased-serde version 0.4 may be provided again in a
    future version, but will be done so in a backwards compatible way.
  • Thanks to @​demurgos for recognizing and fixing this in PR #​359
• Ensure compatibility with -Zminimal-versions flag by specifying minimal dependency versions (fixes #​357)

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