Bump Akka from 1.4.21 to 1.4.27 (#162)

Bumps [Akka](https://github.com/akkadotnet/akka.net) from 1.4.21 to 1.4.27.
- [Release notes](https://github.com/akkadotnet/akka.net/releases)
- [Changelog](https://github.com/akkadotnet/akka.net/blob/dev/RELEASE_NOTES.md)
- [Commits](akkadotnet/akka.net@1.4.21...1.4.27)

---
updated-dependencies:
- dependency-name: Akka
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/common.props

@@ -25,7 +25,7 @@
     <NetCoreTestVersion>netcoreapp3.1</NetCoreTestVersion>
     <NetStandardVersion>netstandard2.0</NetStandardVersion>
     <NetFrameworkTestVersion>net461</NetFrameworkTestVersion>
-    <AkkaVersion>1.4.21</AkkaVersion>
+    <AkkaVersion>1.4.27</AkkaVersion>
     <SourceLinkVersion>1.0.0</SourceLinkVersion>
   </PropertyGroup>
 </Project>