Update dependency com.posthog:posthog-android to v3.21.3

Author: renovate[bot]

gradle/libs.versions.toml

@@ -198,7 +198,7 @@ haze = { module = "dev.chrisbanes.haze:haze", version.ref = "haze" }
 haze_materials = { module = "dev.chrisbanes.haze:haze-materials", version.ref = "haze" }
 
 # Analytics
-posthog = "com.posthog:posthog-android:3.21.2"
+posthog = "com.posthog:posthog-android:3.21.3"
 sentry = "io.sentry:sentry-android:8.21.1"
 # main branch can be tested replacing the version with main-SNAPSHOT
 matrix_analytics_events = "com.github.matrix-org:matrix-analytics-events:0.28.0"