Update tracing-subscriber requirement from 0.2.18 to 0.3.1 in /dione-server

Created by: dependabot[bot]

Updates the requirements on tracing-subscriber to permit the latest version.

Commits

• 2f80978 subscriber: prepare to release v0.3.1 (#1687)
• 94ca5e7 subscriber: fix unused method warnings for Extensions (#1686)
• fd12ae1 subscriber: fix LocalTime being re-exported by the time feature (#1685)
• e65c78b error: prepare to release v0.2.0 (#1681)
• 45fd4f9 opentelemetry: prepare to release v0.16.0 (#1682)
• 007ca8e journald: prepare to release v0.2.0 (#1679)
• aaa419b appender: prepare to release v0.2.0 (#1678)
• 4e56741 subscriber: prepare to release v0.3.0 (#1677)
• f461c5b appender: fix compilation 32-bit platforms like PowerPC (#1675)
• 8777d2c subscriber: rename Layer::new_span to on_new_span (#1674)
• Additional commits viewable in compare view

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