Bump serde from 1.0.171 to 1.0.178

[dependabot[bot]]

Bumps serde from 1.0.171 to 1.0.178.

Release notes

Sourced from serde's releases.

v1.0.178

• Fix build error when using serde with "std" feature turned off and "unstable" feature turned on (#2541)

v1.0.177

• Add serde(rename_all_fields = "...") attribute to apply a rename_all on every struct variant of an enum (#1695, thanks @​jplatte)
• Improve diagnostics for attribute parse errors (#2536, thanks @​jplatte)

v1.0.176

• Allow tag field of an internally tagged enum to have same name as a field inside a skipped struct variant (#2266, thanks @​flisky)

v1.0.175

• Restore missing LICENSE files in serde_derive crate (#2527, thanks @​ankane)

v1.0.174

• Documentation improvements

v1.0.173

• Fix missing trait implementations when using serde derive macro on a macro-generated data structure, such as via the bitflags crate (#2516)

v1.0.172

• Experiment with precompiling the serde_derive macros to reduce build time (#2514)

Commits

• 48aa054 Release 1.0.178
• 3616860 Delete broken symlink from precompiled derive sources
• 861b0df Consistently list StdError under 'Re-exports' heading of rustdoc
• 8b3d71a Merge pull request #2541 from dtolnay/de-core-error
• ff5442c Add no-std unstable build in CI
• 92d686f Fix serde::de::StdError in no-std unstable build
• 7b09ccc Merge pull request #2539 from dtolnay/questionmark
• 6f1f38d Replace 'try!' with '?' in serde_derive
• db8f064 Eliminate workaround for pre-1.17 rustc in serde_derive
• 91ec1c2 Enforce question mark not used in serde crate yet
• Additional commits viewable in compare view

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