fix(deps): update rust crate axum-tracing-opentelemetry to 0.21

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
axum-tracing-opentelemetry (source)	dependencies	minor	0.19 -> 0.21

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Release Notes

davidB/tracing-opentelemetry-instrumentation-sdk (axum-tracing-opentelemetry)

v0.21.0

Compare Source

Fixed

• 🐛 workaround for a delay, batch,... behavior in otlp exporter and test with fake-opentelemetry-collector (closed too early)
• 🐛 fix build of contributions (upgrade of opentelemetry, fake collector for logs,...)
• 🐛 Re-export tracing_level_info feature from axum to sdk (#​147)

Changed

• 💄 update deprecated syntax "default_features" in Cargo.toml
• ⬆️ upgrade to rstest 0.22

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✅ EDITORCONFIG	editorconfig-checker	1		0	0.01s
✅ REPOSITORY	dustilock	yes		no	0.01s
✅ REPOSITORY	gitleaks	yes		no	0.27s
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