Use JSpecify 1.0!

PiperOrigin-RevId: 653332912

Author: cushon

pom.xml

@@ -88,7 +88,7 @@
     <java.version>1.8</java.version>
     <guava.version>32.1.3-jre</guava.version>
     <truth.version>1.4.0</truth.version>
-    <jspecify.version>0.3.0</jspecify.version>
+    <jspecify.version>1.0.0</jspecify.version>
     <errorprone.version>2.28.0</errorprone.version>
     <auto-value.version>1.9</auto-value.version>
     <auto-service.version>1.0.1</auto-service.version>