chore: release v0.5.7

[sumup-bot]

🤖 New release

• sumup: 0.5.6 -> 0.5.7

Changelog

0.5.7 - 2026-03-13

Added

• update to latest openapi specs
• support additionalProperties (#114)
• (sdk) open enums (#106)
• (sdk) improve comments, fields with reserved keywords (#103)

Fixed

• (client) send problem+json accept header (#133)
• (sdk) json numbers (#107)

Other

• synced file(s) with sumup/apis (#134)
• synced file(s) with sumup/apis (#131)
• (deps) bump serial_test from 3.3.1 to 3.4.0 (#125)
• synced file(s) with sumup/apis (#120)
• (deps) bump uuid from 1.20.0 to 1.21.0 (#117)
• synced file(s) with sumup/apis (#113)
• synced file(s) with sumup/apis (#108)
• synced file(s) with sumup/apis (#102)
• (deps) bump uuid from 1.19.0 to 1.20.0 (#98)

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