Bump serde from 1.0.103 to 1.0.104

[dependabot-preview[bot]]

Bumps serde from 1.0.103 to 1.0.104.

Release notes

*Sourced from [serde's releases](https://github.com/serde-rs/serde/releases).* > ## v1.0.104 > - Revert stabilization of Serialize/Deserialize impls for `!` to account for [rust-lang/rust#67224](https://github-redirect.dependabot.com/rust-lang/rust/pull/67224)

Commits

- [`234fbfd`](https://github.com/serde-rs/serde/commit/234fbfd7e355fa100ffd1402458e0fa061761478) Release 1.0.104 - [`b9909ce`](https://github.com/serde-rs/serde/commit/b9909cef3d1d69f1412712f0953ecc6d37aee06c) Revert "Remove never_type feature gate" - [`d540e72`](https://github.com/serde-rs/serde/commit/d540e72fc784e459c75d167973a9ac54ef1bd731) Format with rustfmt 2019-10-07 - [`13d0899`](https://github.com/serde-rs/serde/commit/13d0899776a5b159d712affa571c82eaeffd71c3) Add missing import in de_enum expand test - [`4fefa7a`](https://github.com/serde-rs/serde/commit/4fefa7a01dbac3ebad239b159d4f0fd088be5b67) Format imports in expandtest inputs - [`9048660`](https://github.com/serde-rs/serde/commit/90486607a17ecdca214dcf3a6a5325f2446ba770) Update test suite to nightly-2019-11-26 - [`0b303c7`](https://github.com/serde-rs/serde/commit/0b303c766c3832d68e5b8fb82fd8e4c208ef1352) Mark tests ignored on emscripten rather than omitting - [`c371563`](https://github.com/serde-rs/serde/commit/c371563bfcbf08ff5674ccf1497daf6a214ec342) Reduce nesting of macrotest test cases - [`d17d8eb`](https://github.com/serde-rs/serde/commit/d17d8eb3eea0f11c0ccc7f435d3a959cae30f336) Rely on std::process::Command's path search - [`bcaebdb`](https://github.com/serde-rs/serde/commit/bcaebdb2b772a165e6db7039e34e629c8b249ba6) Merge pull request [#1662](https://github-redirect.dependabot.com/serde-rs/serde/issues/1662) from eupn/use-macrotest - Additional commits viewable in [compare view](https://github.com/serde-rs/serde/compare/v1.0.103...v1.0.104)

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[Aloxaf]

@dependabot recreate

[dependabot-preview[bot]]

Looks like serde is up-to-date now, so this is no longer needed.