Bump tink-java version to 1.16.0

PiperOrigin-RevId: 707033290
Change-Id: I8562ccaf68b99d7bf1e124d11da0b3542e9a0491

tink_version.bzl

diff --git a/tink_version.bzl b/tink_version.bzl
index 05dc680..8ebaf03 100644
--- a/tink_version.bzl
+++ b/tink_version.bzl
@@ -1,2 +1,2 @@
 """Version of the current release of Tink Java."""
-TINK_VERSION_LABEL = "1.15.0"
+TINK_VERSION_LABEL = "1.16.0"