Bump Guava to 33.2.1.

RELNOTES=n/a
PiperOrigin-RevId: 639114032

pom.xml

@@ -20,15 +20,15 @@
       version without the -android and -jre suffixes) because that lets
       Dependabot update our Guava versions.
     -->
-    <guava.android.version>33.2.0-android</guava.android.version>
+    <guava.android.version>33.2.1-android</guava.android.version>
     <!--
       Also, we have this comment in between the 2 flavors of Guava. That's
       also to smooth the Dependabot update process: Dependabot generates a
       separate PR for each flavor. Even if we approve both at the same
       time, one gets submitted before the other, and
       the other ends up with a merge conflict. That requires reapprovals.
     -->
-    <guava.jre.version>33.2.0-jre</guava.jre.version>
+    <guava.jre.version>33.2.1-jre</guava.jre.version>
     <gwt.version>2.10.0</gwt.version>
     <protobuf.version>4.27.0</protobuf.version>
     <!-- Property for protobuf-lite protocArtifact, which isn't a "normal" Maven dep. -->