prepare 6.2.1 release (#311)

## [6.2.1] - 2023-06-27
### Changed:
- Bumping Guava version to incorporate CVE-2023-2976 fixes.

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Co-authored-by: Eli Bishop <[email protected]>
Co-authored-by: LaunchDarklyReleaseBot <[email protected]>
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Author: 19 people

CODEOWNERS

@@ -0,0 +1,2 @@
+# Repository Maintainers
+* @launchdarkly/team-sdk

build.gradle

@@ -70,10 +70,10 @@ ext.libraries = [:]
 ext.versions = [
     "commonsCodec": "1.15",
     "gson": "2.8.9",
-    "guava": "30.1-jre",
+    "guava": "32.0.1-jre",
     "jackson": "2.11.2", 
     "launchdarklyJavaSdkCommon": "2.0.0",
-    "launchdarklyJavaSdkInternal": "1.1.0",
+    "launchdarklyJavaSdkInternal": "1.1.1",
     "launchdarklyLogging": "1.1.0",
     "okhttp": "4.9.3", // specify this for the SDK build instead of relying on the transitive dependency from okhttp-eventsource
     "okhttpEventsource": "4.1.0",