Update dashmap requirement from 5.1 to 6.0

[dependabot[bot]]

Updates the requirements on dashmap to permit the latest version.

Release notes

Sourced from dashmap's releases.

v6.0.0

This release contains performance optimizations, most notably 10-40% gains on Apple Silicon but also 5-10% gains when measured in Intel Sapphire Rapids. This work was accomplished in:

• #303
• #287

Minor QoL improvements were made in:

• #302
• #300

Special to the following contributors for making this release possible:

• @​conradludgate
• @​arthurprs
• @​joshtriplett
• @​dtzxporter

Commits

• 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)
• 0f95f59 Replace internal hashtable with hashbrown RawTable
• 626b98d v5.5.3
• Additional commits viewable in compare view

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