Bump okhttp from 3.14.6 to 3.14.8 in /core (#2644)

Author: dependabot-preview[bot]

core/build.gradle

@@ -146,7 +146,7 @@ dependencies {
 
     shaded "org.yaml:snakeyaml:1.25"
 
-    shaded 'com.squareup.okhttp3:okhttp:3.14.6'
+    shaded 'com.squareup.okhttp3:okhttp:3.14.8'
 
     shaded 'org.glassfish.main.external:trilead-ssh2-repackaged:4.1.2'