Bump serde from 1.0.214 to 1.0.215

Bumps serde from 1.0.214 to 1.0.215.

Release notes

Sourced from serde's releases.

v1.0.215

• Produce warning when multiple fields or variants have the same deserialization name (#2855, #2856, #2857)

Commits

• 8939af4 Release 1.0.215
• fa5d58c Use ui test syntax that does not interfere with rustfmt
• 1a3cf4b Update PR 2562 ui tests
• 7d96352 Merge pull request #2857 from dtolnay/collide
• 111ecc5 Update ui tests for warning on colliding aliases
• edd6fe9 Revert "Add checks for conflicts for aliases"
• a20e924 Revert "pacify clippy"
• b1353a9 Merge pull request #2856 from dtolnay/dename
• c59e876 Produce a separate warning for every colliding name
• 7f1e697 Merge pull request #2855 from dtolnay/namespan
• Additional commits viewable in compare view

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