chore(deps): update rust crate tracing-subscriber to v0.3.21

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
tracing-subscriber (source)	dependencies	patch	0.3.20 -> 0.3.21

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Release Notes

tokio-rs/tracing (tracing-subscriber)

v0.3.21: tracing-subscriber 0.3.21

Compare Source

Fixed

• Change registry exit to decrement local span ref only (#​3331)
• Make Layered propagate on_register_dispatch (#​3379)

Changed

• tracing: updated to 0.1.42 (#​3418)

Performance

• Remove clone_span on enter (#​3289)

Documented

• Fix a few small things in the format module (#​3339)
• Fix extra closing brace in layer docs (#​3350)
• Fix link in FmtSpan docs (#​3411)

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