Bump io.netty:netty-transport-native-kqueue (spiffe#229)

Bumps [io.netty:netty-transport-native-kqueue](https://github.com/netty/netty) from 4.1.107.Final to 4.1.108.Final.
- [Commits](netty/netty@netty-4.1.107.Final...netty-4.1.108.Final)

---
updated-dependencies:
- dependency-name: io.netty:netty-transport-native-kqueue
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Max Lambrecht <[email protected]>

build.gradle

@@ -24,7 +24,7 @@ subprojects {
         shadowVersion = '8.1.1'
 
         //IMPORTANT: This must be in sync with the shaded netty version in gRPC
-        nettyVersion = '4.1.107.Final'
+        nettyVersion = '4.1.108.Final'
     }
 
     apply plugin: 'java-library'