Update hashlink requirement from 0.5 to 0.6

[dependabot-preview]

Updates the requirements on hashlink to permit the latest version.

Changelog

Sourced from hashlink's changelog.

[0.6.0]

• API incompatible change: depend on hashbrown 0.9, re-export renamed hashbrown::TryReserveError type.
• Add a Debug impl to LruCache (thanks @thomcc!)
• Adjust trait bounds for LinkedHashMap::retain, LinkedHashSet::default to be less strict (to match hashbrown)
• Adjust trait bounds for all Debug impls to be less strict (to match hashbrown).
• Adjust trait bounds for all IntoIterator impls to be less strict (to match hashbrown).
• Adjust trait bounds for LruCache::with_hasher, LruCache::capacity, LruCache::len, LruCache::is_empty, LruCache::clear, LruCache::iter, LruCache::iter_mut, and LruCache::drain to be less strict
• Add optional serde support for LinkedHashMap and LinkedHashSet.
• Add to_back and to_front methods for LinkedHashSet to control entry order.

[0.5.1]

• Add LinkedHashMap::remove_entry and LruCache::remove_entry
• Add LruCache::new_unbounded constructor that sets capacity to usize::MAX
• Add LruCache::get method to go with LruCache::get_mut
• Add LruCache::peek and LruCache::peek_mut to access the cache without moving the entry in the LRU list

[0.5.0]

• API incompatible change: depend on hashbrown 0.7

[0.4.0]

• API incompatible change: depend on hashbrown 0.6
• Passes miri

[0.3.0]

• Add some minimal documentation for methods that change the internal ordering.
• Decide on a pattern for methods that change the internal ordering: the word "insert" means that it will move an existing entry to the back.
• Some methods have been renamed to conform to the above system.

[0.2.1]

• Fix variance for LinkedHashMap (now covariant where appropriate)
• Add Debug impls to many more associated types
• Add LinkedHashSet
• Add LinkedHashMap::retain

[0.2.0]

• Move linked_hash_map into its own module
• Add LruCache type ported from lru-cache crate into its own module
• Add LruCache entry and raw-entry API
• Add linked_hash_map IntoIter iterator that is different from Drain iterator
• Make Drain iterator recycle freed linked list nodes

[0.1.0]

Commits

• a244c74 (cargo-release) version 0.6.0
• 6200370 Update CHANGELOG for relaxed trait bounds, Debug impls
• d9b5a7e Relax the trait bounds for many methods to match hashbrown
• 97218cf Merge pull request #4 from thomcc/debug
• 6d83090 impl Debug for LruCache
• 4ad4ab4 Update to hashbrown 0.9
• e6bb0eb Add LinkedHashSet::to_front and LinkedHashSet::to_back methods
• c9eb9b3 Merge pull request #3 from rytone/feature/serde
• 77d6e8d Remove LruCache import
• 1cce11a Remove serde support for LruCache
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #136.