Update module go.opencensus.io to v0.23.0

This MR contains the following updates:

Package	Type	Update	Change
go.opencensus.io	require	minor	v0.22.6 -> v0.23.0

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Release Notes

census-instrumentation/opencensus-go

v0.23.0

Compare Source

No breaking changes

Additions

• OpenTelemetry interop
  • allow users to replace the trace SDK (#​1238)
  • expose underlying span implementation (#​1240)
• Expose ability to flush interval reader (#​1248)
• Add GC stats to runmetrics plugin (#​1207)
• Dependency upgrades (#​1243)

Fixes

• Performance improvements (#​1242)
• Fix memory leak in span store (#​1246)

Miscellaneous

• Migrate from Travis CI to Github Actions (#​1237, #​1244)

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