Bump serde_json from 1.0.120 to 1.0.121

Bumps serde_json from 1.0.120 to 1.0.121.

Release notes

Sourced from serde_json's releases.

v1.0.121

• Optimize position search in error path (#1160, thanks @​purplesyringa)

Commits

• eca2658 Release 1.0.121
• b0d678c Merge pull request #1160 from iex-rs/efficient-position
• b1edc7d Optimize position search in error path
• 40dd7f5 Merge pull request #1159 from iex-rs/fix-recursion
• 6a306e6 Move call to tri! out of check_recursion!
• 3f1c6de Ignore byte_char_slices clippy lint in test
• 3fd6f5f Merge pull request #1153 from dpathakj/master
• fcb5e83 Correct documentation URL for Value's Index impl.
• See full diff in compare view

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