build(deps): bump Serilog from 3.0.0-dev-01921 to 3.1.1

[dependabot]

Bumps Serilog from 3.0.0-dev-01921 to 3.1.1.

Release notes

Sourced from Serilog's releases.

v3.1.1

• #1977 - don't stack overflow when disposing ReusableStringWriter with large renderings (@​nblumhardt)

This is a bugfix for release 3.1.0.

v3.1.0

• #1935 - remove CHANGES.md (@​sungam3r)
• #1936, #1922 - README.md updates (@​nblumhardt)
• #1942 - remove redundant GetTypeInfo() calls (@​SimonCropp)
• #1947 - message template caching performance improvements (@​epeshk)
• #1948 - reduce allocations in Logger.Write() (@​epeshk)
• #1955 breaking - collect and propagate Activity.Current.TraceId and SpanId automatically in Logger.Write() (@​nblumhardt)
• #1964 - don't cache reusable string writers with large buffer sizes (@​Jakimar)
• #1969 - README.md updates (@​bartelink)
• #1971 - drop test coverage for unsupported .NET Core versions (@​bartelink)

Built-in trace and span id support

This release adds two new first-class properties to LogEvent: TraceId and SpanId. These are set automatically in Logger.Write() to the corresponding property values from System.Diagnostics.Activity.Current.

The major benefit of this change is that sinks, once updated, can reliably propagate trace and span ids through to back-ends that support them (in much the same way that first-class timestamps, messages, levels, and exceptions are used today).

The sinks maintained under serilog/serilog, along with formatting helpers such as Serilog.Formatting.Compact and Serilog.Expressions, are already compatible with this change or have pending releases that add compatibility.

Dropped .NET Core 2.1 and 3.0 support

On .NET Core 2.1 and 3.0, projects targeting Serilog 3.1+ will fail to build, with:

/project/packages/system.runtime.compilerservices.unsafe/6.0.0/buildTransitive/netcoreapp2.0
/System.Runtime.CompilerServices.Unsafe.targets(4,5): error : System.Runtime.CompilerServices.Unsafe
doesn't support netcoreapp2.1. Consider updating your TargetFramework to netcoreapp3.1 or later.

Affected consumers should continue to use Serilog 3.0 or earlier. See serilog/serilog#1983 for a discussion of this issue.

Technical breaking change

Trace and span id collection includes support for {TraceId} and {SpanId} placeholders in output templates (commonly used when formatting text log files). Where previously these names resolved to user-defined properties, they now resolve to the built-in LogEvent.TraceId and LogEvent.SpanId values, respectively.

Impact is expected to be low/zero, because the trace and span id values in any user-added properties are almost certainly identical to the built-in ones.

v3.0.1

• #1926 - fix JsonFormatter output for renderMessage = true (@​nblumhardt)

v3.0.0

What's new in 3.0.0?

Target framework changes - Serilog no longer targets netstandard1.x or .NET Framework versions earlier than .NET 4.6.2. Users on affected frameworks should continue to target Serilog 2.12.x.

... (truncated)

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