Update hashlink requirement from 0.5 to 0.7

[dependabot-preview]

Updates the requirements on hashlink to permit the latest version.

Changelog

Sourced from hashlink's changelog.

[0.7.0]

• API incompatible change: depend on hashbrown 0.11, changes re-exported types.
• Fix LinkedHashSet::back to take &self not &mut self.
• API incompatible change: equality tests on LinkedHashSet are now ordered, similar to LinkedHashMap.
• Make the serde Deserialize implementations on LinkedHashMap and LinkedHashSet generic on the BuildHasher type.
• Add to_back and to_front methods for LinkedHashMap to control entry order.

[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

... (truncated)

Commits

• 491feb0 (cargo-release) version 0.7.0
• c860acc Actually test all features with circle-ci
• c7575ca Prepare for 0.7 release
• 5daeea9 Make LinkedHashSet deserialize also generic on the BuildHasher type.
• 9b42ad0 Merge pull request #7 from robinbernon/generic_hashmap_deserialization
• b283e8b Depend on hashbrown 0.11
• 4fb1b6d API Breaking: Equality tests on LinkedHashSet should be consistent
• 9b0ee5d Add LinkedHashMap::to_front and LinkedHashMap::to_back entries.
• 6446756 Correcting test
• 1262825 Making the deserialization for LinkedHashMap generic for build hasher type
• Additional commits viewable in compare view

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