Bump Guava, usually to 33.4.5.

...but only to 33.4.3 in Truth: 33.4.4 and higher contain type-use annotations, which [confuse old version of GWT unless we declare a GWT module for them](jspecify/jspecify#184). And we can't upgrade our version of GWT for [multiple reasons](#1378).

RELNOTES=n/a
PiperOrigin-RevId: 738856241

Author: cpovirk

pom.xml

@@ -20,15 +20,15 @@
       version without the -android and -jre suffixes) because that lets
       Dependabot update our Guava versions.
     -->
-    <guava.android.version>33.4.0-android</guava.android.version>
+    <guava.android.version>33.4.3-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>33.4.0-jre</guava.jre.version>
+    <guava.jre.version>33.4.3-jre</guava.jre.version>
     <gwt.version>2.11.0</gwt.version>
     <protobuf.version>4.29.3</protobuf.version>
     <!-- Property for protobuf-lite protocArtifact, which isn't a "normal" Maven dep. -->