Update Rust crate heapless to 0.7.16

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
heapless	dev-dependencies	patch	0.7.10 -> 0.7.16

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Release Notes

japaric/heapless

v0.7.16

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Added

• add more PartialEq implementations to Vec where Vec is the RHS

Changed

Fixed

• clarify in the docs that the capacity heapless::String is in bytes, not characters
• Fixed some broken links in the documentation.

v0.7.15

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Added

• Added Vec::insert(index, element)
• Added Vec::remove(index)
• Added Vec::retain(f)
• Added Vec::retain_mut(f)

v0.7.14

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Added

• Added support for AVR architecture.

Fixed

• IndexSet and IndexMap's default method now compile time checks that their capacity is a power of two.

v0.7.13

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Added

• Added into_vec to BinaryHeap

v0.7.12

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Added

• Added support for AVR architecture.
• Add entry API to IndexMap
• Implement IntoIterator trait for Indexmap
• Implement FromIterator for String
• Add first and last methods to IndexMap and IndexSet
• Add pop_{front_back}_unchecked methods to Deque

Changed

• Optimize the codegen of Vec::clone
• riscv32i and riscv32imc targets unconditionally (e.g. build --no-default-features) depends on atomic-polyfill

Fixed

• Inserting an item that replaces an already present item will no longer
  fail with an error

v0.7.11

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Fixed

• Fixed pool example in docstring.
• Fixed undefined behavior in Vec::truncate(), Vec::swap_remove_unchecked(),
  and Hole::move_to() (internal to the binary heap implementation).
• Fixed BinaryHeap elements are being dropped twice

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