build(deps): bump heapless from 0.5.5 to 0.7.3

[dependabot-preview]

Bumps heapless from 0.5.5 to 0.7.3.

Changelog

Sourced from heapless's changelog.

[v0.7.3] - 2021-07-1

Changed

• Box::freeze is deprecated due to possibility of undefined behavior.

[v0.7.2] - 2021-06-30

Added

• Added new Vec::into_array method
• Added const-asserts to all data structures

[v0.7.1] - 2021-05-23

Changed

• MPMC is now more generic

Added

• defmt for Vec and String

[v0.7.0] - 2021-04-23

Changed

• [breaking-change] Converted all data structures to use the const generics MVP
• [breaking-change] HistoryBuffer is now working with const constructors and non-Copy data
• [breaking-change] HistoryBuffer::as_slice and others now only return initialized values
• Added missing Deref, AsRef and Debug for HistoryBuffer
• [breaking-change] MultiCore/SingleCore and Uxx is now removed from spsc::Queue
• [breaking-change] spsc::Queue is now usize only
• [breaking-change] spsc::Queue now sacrifices one element for correctness (see issue #207), i.e. it creates an N - 1 sized queue instead of the old that generated an size N queue
• [breaking-change] String has had utf8 related methods removed as this can be done via str
• [breaking-change] No data structures implement AsSlice traits any more, now using AsRef and AsMut as they work with any size of array now

Fixed

• Pool and MPMC now works on thumbv6m
• IndexMap::new() is now a const-fn

[v0.6.1] - 2021-03-02

Fixed

• Security issue.

[v0.6.0] - 2021-02-02

... (truncated)

Commits

• 2390ab7 Merge pull request #217 from japaric/deprecate-freeze-v0.7.3
• 01f16f1 Deprecate Box::freeze, prepare v0.7.3
• 1d502c0 Merge pull request #215 from japaric/v0.7.2-release
• 295e115 Preparing v0.7.2
• 22e4c73 Merge pull request #211 from GrantM11235/vec_into_array
• 90daba1 Add new Vec::into_array method
• 3b49836 Preparing for v0.7.1
• 6d1a2ed Merge pull request #172 from theunkn0wn1/feature/defmt
• 63d0ed8 cargo fmt
• f4617ea attempt at reimplementing on a clean history
• Additional commits viewable in compare view

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