Bump serde from 1.0.104 to 1.0.106

[dependabot-preview]

Bumps serde from 1.0.104 to 1.0.106.

Release notes

Sourced from serde's releases.

v1.0.106

• Hide dummy const implementation detail from rustdoc when documenting a binary crate (#1768, thanks @robo9k)

v1.0.105

• Allow #[serde(borrow)] to work on non-standard Cow types (#1754, thanks @maciejhirsz)

Commits

• d156452 Release 1.0.106
• 645f672 Merge pull request #1768 from robo9k/dummy-const-hidden-doc
• a135199 Hide generated dummy const in rustdoc
• 2a9971a Merge pull request #1764 from serde-rs/collect
• e2ada0e Simplify default Serializer::collect_str implementation
• 69653a7 Release 1.0.105
• c33fb95 Merge pull request #1754 from maciejhirsz/non-std-cow-borrow
• ec6ca6b Allow non-std Cow borrows
• 078e88b Select a single docs.rs build target
• 1894cb7 Resolve clippy question_mark lint
• Additional commits viewable in compare view

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