Bump heapless from 0.8.0 to 0.9.1

[dependabot]

Bumps heapless from 0.8.0 to 0.9.1.

Release notes

Sourced from heapless's releases.

v0.9.1

See the full changelog here: https://github.com/rust-embedded/heapless/blob/v0.9.1/CHANGELOG.md#v091

0.9.0

See the full changelog here: https://github.com/rust-embedded/heapless/blob/v0.9.0/CHANGELOG.md#v090---2025-04-28

Changelog

Sourced from heapless's changelog.

[v0.9.1] - 2025-08-19

Added

• Added String::insert and String::insert_str.

Added

• Added optional embedded_io::Write impl for Vec.

Changed

• bytes::BufMut is now implemented on VecInner.
• Removed generic from history_buf::OldestOrdered.
• Made LenType opt-in.
• Minor fixes to pool::boxed docs.
• Add missing Debug derive to vec::IntoIter.
• Removed generic from spsc::Consumer, spsc::Producer and spsc::Iter.
• Added LinearMap::entry() API.
• Added LinearMap::retain().

Fixed

• CI now uses flags specified in Cargo.toml for rustdoc tests.
• Fixed clippy lints.
• Fixed the memory layout of the internal UnionNode<T> type, fixing possible Undefined Behaviour.

Removed

• Removed invalid bytes::Buf implementation.
• Removed DefaultLenType struct.

[v0.9.0] - 2025-04-28 [YANKED]

Added

• Added bytes::Buf and bytes::BufMut implementations for Vec.
• Added format macro.
• Added String::from_utf16.
• Added is_full, recent_index, oldest, and oldest_index to HistoryBuffer
• Added is_full to BinaryHeap
• Added is_full to IndexMap
• Added is_full to IndexSet
• Added is_full to LinearMap
• Added infallible conversions from arrays to Vec.
• Added Vec::spare_capacity_mut.
• Added Extend impls for Deque.
• Added Deque::make_contiguous.
• Added VecView, the !Sized version of Vec.
• Added pool implementations for 64-bit architectures.

... (truncated)

Commits

• 1918822 Merge pull request #574 from Nitrokey/release-091
• 0a764cd Prepare release 0.9.1
• 3b0283f Merge pull request #590 from sgued/spsc-demonomorphize
• c1c0d19 Keep lines below 100 chars
• e9da36a Make the docs for QueueView::split_const actually use QueueView
• 2f17443 De-monomorphize spsc consumer, producer and iterators
• 331aac8 Merge pull request #587 from sgued/fix-docs
• 1702129 Add alloc in CI tests
• a13946d Fix broken tests and docs
• b94d0b4 Enable more features in tests
• Additional commits viewable in compare view

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