build(deps): bump cbor2 from 5.8.0 to 5.9.0

[dependabot]

Bumps cbor2 from 5.8.0 to 5.9.0.

Release notes

Sourced from cbor2's releases.

5.9.0

• Added the max_depth decoder parameter to limit the maximum allowed nesting level of containers, with a default value of 400 levels (CVE-2026-26209)
• Changed the default read_size from 4096 to 1 for backwards compatibility. The buffered reads introduced in 5.8.0 could cause issues when code needs to access the stream position after decoding. Users can opt-in to faster decoding by passing read_size=4096 when they don't need to access the stream directly after decoding. Added a direct read path for read_size=1 to avoid buffer management overhead. (#275; PR by @​andreer)
• Fixed C encoder not respecting string referencing when encoding string-type datetimes (tag 0) (#254)
• Fixed a missed check for an exception in the C implementation of CBOREncoder.encode_shared() (#287)
• Fixed two reference/memory leaks in the C extension's long string decoder (#290 PR by @​killiancowan82)
• Fixed C decoder ignoring the str_errors setting when decoding strings, and improved string decoding performance by using stack allocation for small strings and eliminating unnecessary conditionals. Benchmarks show 9-17% faster deserialization. (#255; PR by @​andreer)

Commits

• 93c5988 Bumped up the version
• d903d62 Updated the max_depth default value in the C function signature
• 2b53b28 Stack allocate small strings (#270)
• a7ac10d Upped the max_depth value to 400
• 54c8ed5 Fixed reference/memory leaks in decode_definite_long_string (#290)
• a8d92dc [pre-commit.ci] pre-commit autoupdate (#289)
• c91aa00 [pre-commit.ci] pre-commit autoupdate (#288)
• 53521e7 Fixed ssize_t to Py_ssize_t
• 94e0d21 Added missing Python counterpart for max_depth
• bcb6cea Added the max_depth decoder parameter
• Additional commits viewable in compare view

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview, Comment	Mar 30, 2026 10:07pm

[injaneity]

closed as superseded by security dependency rollup in #2000

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.