Bump heapless from 0.7.11 to 0.7.12

[dependabot[bot]]

Bumps heapless from 0.7.11 to 0.7.12.

Changelog

Sourced from heapless's changelog.

[v0.7.12] - 2022-05-12

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

Commits

• 4431ae1 v0.7.12
• 02773a5 Merge #293
• 50c0930 update changelog
• a94c1d0 riscv32imc needs the same treatment
• 34b05be add changelog entry
• 5d9e4b6 unconditionally depend on atomic-polyfill for riscv32i target
• 3129e29 GHA: cargo check --no-default-features
• c2a022d Merge #292
• fbc5d5b make Deque::pop_{front,back}_unchecked public
• 622a676 Merge #291
• Additional commits viewable in compare view

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