Update Rust crate tracing-subscriber to v0.3.16

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
tracing-subscriber (source)	dependencies	patch	=0.3.15 -> =0.3.16

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Release Notes

tokio-rs/tracing

v0.3.16

Compare Source

This release of tracing-subscriber fixes a regression introduced in
v0.3.15 where Option::None's Layer implementation would
set the max level hint to OFF. In addition, it adds several new APIs,
including the Filter::event_enabled method for filtering events based on
fields values, and the ability to log internal errors that occur when writing a
log line.

This release also replaces the dependency on the unmaintained [ansi-term]
crate with the [nu-ansi-term] crate, resolving an informational security
advisory (RUSTSEC-2021-0139) for [ansi-term]'s maintainance status. This
increases the minimum supported Rust version (MSRV) to Rust 1.50+, although the
crate should still compile for the previous MSRV of Rust 1.49+ when the ansi
feature is not enabled.

Fixed

• layer: Option::None's Layer impl always setting the max_level_hint
  to LevelFilter::OFF (#​2321)
• Compilation with -Z minimal versions (#​2246)
• env-filter: Clarify that disabled level warnings are emitted by
  tracing-subscriber (#​2285)

Added

• fmt: Log internal errors to stderr if writing a log line fails (#​2102)
• fmt: FmtLayer::log_internal_errors and
  FmtSubscriber::log_internal_errors methods for configuring whether internal
  writer errors are printed to stderr (#​2102)
• fmt: #[must_use] attributes on builders to warn if a Subscriber is
  configured but not set as the default subscriber (#​2239)
• filter: Filter::event_enabled method for filtering an event based on its
  fields (#​2245, #​2251)
• filter: Targets::default_level accessor ([#​2242])

Changed

• ansi: Replaced dependency on unmaintained ansi-term crate with
  nu-ansi-term ((#​2287, fixes informational advisory RUSTSEC-2021-0139)
• tracing-core: updated to 0.1.30
• Minimum Supported Rust Version (MSRV) increased to Rust 1.50+ (when the
  ansi) feature flag is enabled (#​2287)

Documented

• fmt: Correct inaccuracies in fmt::init documentation (#​2224)
• filter: Fix incorrect doc link in filter::Not combinator (#​2249)

Thanks to new contributors @​cgbur, @​DesmondWillowbrook, @​RalfJung, and
@​poliorcetics, as well as returning contributors @​CAD97, @​connec, @​jswrenn,
@​guswynn, and @​bryangarza, for contributing to this release!

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☔ The latest upstream changes (presumably 8a8b721) made this pull request unmergeable. Please resolve the merge conflicts.