prepare 6.2.1 release (#311)

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

---------

Co-authored-by: Eli Bishop <eli@launchdarkly.com>
Co-authored-by: LaunchDarklyReleaseBot <launchdarklyreleasebot@launchdarkly.com>
Co-authored-by: Alex Engelberg <aengelberg@launchdarkly.com>
Co-authored-by: Anton Mostovoy <anton@mostovoy.net>
Co-authored-by: LaunchDarklyCI <dev@launchdarkly.com>
Co-authored-by: LaunchDarklyCI <LaunchDarklyCI@users.noreply.github.com>
Co-authored-by: Gavin Whelan <gwhelan@launchdarkly.com>
Co-authored-by: ssrm <ssrm@users.noreply.github.com>
Co-authored-by: Harpo Roeder <hroeder@launchdarkly.com>
Co-authored-by: Ben Woskow <48036130+bwoskow-ld@users.noreply.github.com>
Co-authored-by: Elliot <35050275+Apache-HB@users.noreply.github.com>
Co-authored-by: Robert J. Neal <rneal@launchdarkly.com>
Co-authored-by: Robert J. Neal <robertjneal@users.noreply.github.com>
Co-authored-by: Sam Stokes <sstokes@launchdarkly.com>
Co-authored-by: Ember Stevens <ember.stevens@launchdarkly.com>
Co-authored-by: ember-stevens <79482775+ember-stevens@users.noreply.github.com>
Co-authored-by: Alex Engelberg <alex.benjamin.engelberg@gmail.com>
Co-authored-by: Louis Chan <lchan@launchdarkly.com>
Co-authored-by: Louis Chan <91093020+louis-launchdarkly@users.noreply.github.com>
Co-authored-by: Todd Anderson <tanderson@launchdarkly.com>
Co-authored-by: tanderson-ld <127344469+tanderson-ld@users.noreply.github.com>
Co-authored-by: Matthew M. Keeler <mkeeler@launchdarkly.com>
Co-authored-by: ld-repository-standards[bot] <113625520+ld-repository-standards[bot]@users.noreply.github.com>
Co-authored-by: Kane Parkinson <93555788+kparkinson-ld@users.noreply.github.com>

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",