Update fastutil to version 7.2.1

Fixes: b/280554852
Change-Id: I2068414c66cdc9a25ff2adbcc374b43f7f333e3c
diff --git a/build.gradle b/build.gradle
index e61a25d..ea3f498 100644
--- a/build.gradle
+++ b/build.gradle
@@ -31,7 +31,7 @@
     asmVersion = '9.5'  // When updating update tools/asmifier.py, build.src and Toolhelper as well.
     javassistVersion = '3.29.2-GA'
     espressoVersion = '3.0.0'
-    fastutilVersion = '7.2.0'
+    fastutilVersion = '7.2.1'
     guavaVersion = '31.1-jre'
     joptSimpleVersion = '4.6'
     gsonVersion = '2.7'