chore: bump serde from 1.0.204 to 1.0.209

[dependabot[bot]]

Bumps serde from 1.0.204 to 1.0.209.

Release notes

Sourced from serde's releases.

v1.0.209

• Fix deserialization of empty structs and empty tuples inside of untagged enums (#2805, thanks @​Mingun)

v1.0.208

• Support serializing and deserializing unit structs in a flatten field (#2802, thanks @​jonhoo)

v1.0.207

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

v1.0.206

• Improve support for flatten attribute inside of enums (#2567, thanks @​Mingun)

v1.0.205

• Use serialize_entry instead of serialize_key + serialize_value when serialize flattened newtype enum variants (#2785, thanks @​Mingun)
• Avoid triggering a collection_is_never_read lint in the deserialization of enums containing flattened fields (#2791)

Commits

• 30752ac Release 1.0.209
• b84e6ca Improve wording of PR 2805 comments
• 87a2fb0 Wrap comments from PR 2805 to 80 columns
• 9eaf7b9 Merge pull request #2805 from Mingun/untagged-tests
• 7bde100 Replace MapRefDeserializer with value::MapDeserializer
• da7fc79 Fix deserialization of empty struct variant in untagged enums
• 4c5fec1 Test special cases that reaches SeqRefDeserializer::deserialize_any len==0 co...
• 6588b0a Cover Content::Seq case in VariantRefDeserializer::struct_variant
• 0093f74 Split test newtype_enum into four tests for each variant
• 171c6da Complete coverage of ContentRefDeserializer::deserialize_newtype_struct
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 30.78%. Comparing base (61cf57c) to head (a0b9eb4).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #546 +/- ## ======================================= Coverage 30.78% 30.78% ======================================= Files 15 15 Lines 1585 1585 ======================================= Hits 488 488 Misses 1097 1097 ```

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[dependabot[bot]]

Superseded by #551.