Update okio to 3.4

We were using a year old version hence it is good to update
as we prepare for beta.

Bug: n/a
Test: CI + :datastore:datastore-core-okio:allTests
Change-Id: I4efdc73f97d41d666651a89e0c275c518fc8fd60
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 8c7fe3d6..28f0bff 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -227,7 +227,7 @@
 multidex = { module = "androidx.multidex:multidex", version = "2.0.1" }
 nullaway = { module = "com.uber.nullaway:nullaway", version = "0.3.7" }
 okhttpMockwebserver = { module = "com.squareup.okhttp3:mockwebserver", version = "3.14.7" }
-okio = { module = "com.squareup.okio:okio", version = "3.1.0" }
+okio = { module = "com.squareup.okio:okio", version = "3.4.0" }
 opentest4j = { module = "org.opentest4j:opentest4j", version = "1.2.0" }
 playFeatureDelivery = { module = "com.google.android.play:feature-delivery", version = "2.0.1" }
 playCore = { module = "com.google.android.play:core", version = "1.10.3" }