Bump serde from 1.0.125 to 1.0.127 in /exonum-java-binding/core/rust

[dependabot-preview[bot]]

Bumps serde from 1.0.125 to 1.0.127.

Release notes

Sourced from serde's releases.

v1.0.127

• Resolve warning in rustc nightly-2021-07-31+ compiling serde_test

v1.0.126

• Resolve conflict with forbid(future_incompatible) lint setting in generated code (#2026, thanks @​hyd-dev)

Commits

• e2f8568 Release 1.0.127
• 8b840c3 Resolve semicolon_in_expressions_from_macros warning in serde_test
• 9c39115 Ignore buggy nonstandard_macro_braces clippy lint
• 89342af Merge pull request #2047 from jsoref/spelling
• 3c5e2d1 spelling: implicitly
• 3805c03 Merge pull request #2040 from dtolnay/test
• 7045fee Fix outdated test instructions in CONTRIBUTING.md
• 9d81532 Merge pull request #2039 from dtolnay/test
• 5e47432 Update documented test command for the serde directory
• 7b84089 Resolve needless_borrow clippy lints
• Additional commits viewable in compare view

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