Update dashmap requirement from 5.5.3 to 6.1.0

[dependabot[bot]]

Updates the requirements on dashmap to permit the latest version.

Release notes

Sourced from dashmap's releases.

v6.1.0

• xacrimon/dashmap#308

Commits

• f2d248e v6.1.0
• da6ac5e Add typesize::TypeSize implementation for DashMap/DashSet (#308)
• 633aadb v6.0.1
• 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...
• Additional commits viewable in compare view

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