chore(deps): update rust crate serial_test to v4

[bug-ops]

This PR contains the following updates:

Package	Type	Update	Change
serial_test	workspace.dependencies	major	3.5.0 → 4.0.1

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Release Notes

palfrey/serial_test (serial_test)

v4.0.1

Compare Source

As per v4.0.0, but with the root MSRV correctly set to 1.93.1

v4.0.0

Compare Source

What's Changed

• MSRV is now 1.93.1
• refactor(derive)!: bump syn to v3 by @​AudaciousAxiom in #​159

New Contributors

• @​AudaciousAxiom made their first contribution in #​159

Full Changelog: palfrey/serial_test@v3.5.0...v4.0.0

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