Update dashmap requirement from 5.5.3 to 6.0.1

[dependabot[bot]]

Updates the requirements on dashmap to permit the latest version.

Release notes

Sourced from dashmap's releases.

v6.0.1

This is a patch release, now the main release for v6 as v6.0.0 was yanked shortly after release.

Thanks to @​JesusGuzmanJr for notifying me about a critical bug that was introduced so that I could resolve it: #304.

PRs for this release: #305 + https://github.com/xacrimon/dashmap/commit/d5c8be6213ca85d7e3ccbcc1eb5b95651ce7e253

Commits

• d5c8be6 add shrink_to_fit test
• 488dbfa fix deadlock in shrink_to_fit (#305)
• 458238c v6.0.0
• 1e3df1a v6.0.0-rc.1
• bdb86b0 Merge branch 'arthurprs-small-optimizations'
• 4cdfc39 fix: merge errors
• 74b34f8 Merge branch 'small-optimizations' of github.com:arthurprs/dashmap into arthu...
• 5514533 Allow map_in_place to be called then the callee is already panicking. (#300)
• 4be6f57 Re-export Entry types at top level (#302)
• 92d64ba cache-align the shards to improve throughput (#303)
• Additional commits viewable in compare view

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