Bump the serde group with 2 updates

[dependabot]

Bumps the serde group with 2 updates: serde and serde_json.

Updates serde from 1.0.208 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)

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

Updates serde_json from 1.0.125 to 1.0.127

Release notes

Sourced from serde_json's releases.

1.0.127

• Add more removal methods to OccupiedEntry (#1179, thanks @​GREsau)

1.0.126

• Improve string parsing on targets that use 32-bit pointers but also have fast 64-bit integer arithmetic, such as aarch64-unknown-linux-gnu_ilp32 and x86_64-unknown-linux-gnux32 (#1182, thanks @​CryZe)

Commits

• 5ebf65c Release 1.0.127
• f287a3b Merge pull request 1179 from GREsau/patch-1
• ec980b0 Release 1.0.126
• e6282b0 Merge pull request #1184 from serde-rs/fastarithmetic
• ffc4a43 Improve cfg names for fast arithmetic
• 4b1048d Merge pull request #1183 from serde-rs/arithmetic
• f268173 Unify chunk size choice between float and string parsing
• fec0376 Merge pull request #1182 from CryZe/chunk-64bit
• 3d837e1 Ensure the SWAR chunks are 64-bit in more cases
• 11fc61c Add OccupiedEntry::shift_remove() and swap_remove()
• Additional commits viewable in compare view

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