Bump Guava to 33.4.8.

RELNOTES=n/a
PiperOrigin-RevId: 747504024

Author: cpovirk

pom.xml

@@ -97,7 +97,7 @@
     <auto-service.version>1.1.1</auto-service.version>
     <auto-common.version>1.2.2</auto-common.version>
     <java.version>1.8</java.version>
-    <guava.version>33.4.7-jre</guava.version>
+    <guava.version>33.4.8-jre</guava.version>
     <errorprone.version>2.37.0</errorprone.version>
   </properties>