Bump serde from 1.0.206 to 1.0.207 in /rust

[dependabot[bot]]

Bumps serde from 1.0.206 to 1.0.207.

Release notes

Sourced from serde's releases.

v1.0.207

• Improve interactions between flatten attribute and skip_serializing/skip_deserializing (#2795, thanks @​Mingun)

Commits

• 1b4da41 Release 1.0.207
• f61d452 Touch up PR 2795
• f986609 Merge pull request #2795 from Mingun/has-flatten-rework
• 77a6a9d Take into account only not skipped flatten fields when choose serialization form
• 547d843 Remove dead code - serialize_struct_as_map always called when cattrs.has_flat...
• 005cb84 Fail with an understandable message is number of fields for serialization is ...
• fd5b5e9 Correctly calculate has_flatten attribute in all cases for deserialization
• 0647a7c Fix creating and filling a collections that was not read
• See full diff in compare view

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