Update guzzlehttp/psr7 requirement from ^2.6 to ^2.9

[dependabot]

Updates the requirements on guzzlehttp/psr7 to permit the latest version.

Release notes

Sourced from guzzlehttp/psr7's releases.

2.9.0

Added

• Added nested array expansion support to MultipartStream
• Added @return static to MessageTrait methods

Changed

• Updated MIME type mappings

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See also the change log for changes.

Changelog

Sourced from guzzlehttp/psr7's changelog.

2.9.0 - 2026-03-10

Added

• Added nested array expansion support to MultipartStream
• Added @return static to MessageTrait methods

Changed

• Updated MIME type mappings

2.8.1 - 2026-03-10

Fixed

• Encode + signs in Uri::withQueryValue() and Uri::withQueryValues() to prevent them being interpreted as spaces

2.8.0 - 2025-08-23

Added

• Allow empty lists as header values

Changed

• PHP 8.5 support

2.7.1 - 2025-03-27

Fixed

• Fixed uppercase IPv6 addresses in URI

Changed

• Improve uploaded file error message

2.7.0 - 2024-07-18

Added

• Add Utils::redactUserInfo() method
• Add ability to encode bools as ints in Query::build

2.6.3 - 2024-07-18

Fixed

• Make StreamWrapper::stream_stat() return false if inner stream's size is null

... (truncated)

Commits

• 7d0ed42 Release 2.9.0
• a496afd Add additional tests covering IPv6 URI parsing (#641)
• a7da5ad Added @return static to MessageTrait methods (#639)
• 86334e8 [2.9] Added nested array expansion support to MultipartStream (#638)
• df18043 [2.9] Updated MIME type mappings and automated generation (#637)
• 718f1ee Release 2.8.1
• bf5b578 [2.8] Encode plus sign in withQueryValue() and withQueryValues() (#636)
• 27b6714 Add regression test for detach() on non-seekable streams (#634)
• c36ec48 Update CI workflows, upgrade PHPStan, and remove Psalm (#635)
• 21dc724 Release 2.8.0
• Additional commits viewable in compare view

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[coveralls]

coverage: 99.449%. remained the same
when pulling 55cbd0e on dependabot/composer/guzzlehttp/psr7-tw-2.9
into 025043e on 4.x.

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