Update dependency Serilog.Sinks.ApplicationInsights to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
Serilog.Sinks.ApplicationInsights	nuget	major	3.1.0 -> 4.0.0

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Release Notes

serilog-contrib/serilog-sinks-applicationinsights

v4.0.0

Breaking changes

• #​194 - switch from instrumentationKey to connectionString (@​zyofeng)

To migrate, change any references to instrumentationKey to connectionString instead (including in JSON configuration). Discussion in #​163.

Other changes

• #​160 - update README with information about deprecated TelemetryConfiguration.Active (@​dglozano, @​vany0114 )
• #​169 - build and packaging updates (@​nblumhardt)
• #​171 - point build badge to dev (@​nblumhardt)
• #​148 - update Application Insights dependency (@​RiverPhillips)
• #​185, #​199 - CI/publishing updates (@​nblumhardt)
• #​159 - LoggingLevelSwitch support (@​jotabe-net)
• #​186 - fix string escaping (@​cmeeren)
• #​187 - update to C# 10 (@​nblumhardt)
• #​188 - don't JSON-encode the contents of string literal properties (@​nblumhardt)
• #​190 - add tests verifying property formatting (@​cmeeren)
• #​193 - updated README to clarify Azure Functions usage (@​zyofeng)

Thanks

Extra thanks to everyone who contributed to this release! It's been a rather drawn-out and awkward one, with a lot of changes sitting on dev for an extended period of time while we figured out the way forwards (and thanks also to everyone who had input into that!).

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