chore(deps): update dependency com.google.errorprone:error_prone_core to v2.51.0

pom.xml

@@ -477,7 +477,7 @@
                 <path>
                   <groupId>com.google.errorprone</groupId>
                   <artifactId>error_prone_core</artifactId>
-                  <version>2.50.0</version>
+                  <version>2.51.0</version>
                 </path>
                 <path>
                   <groupId>com.uber.nullaway</groupId>

prometheus-metrics-model/src/main/java/io/prometheus/metrics/model/snapshots/Unit.java

@@ -75,6 +75,6 @@ public boolean equals(Object o) {
 
   @Override
   public int hashCode() {
-    return Objects.hash(name);
+    return 31 + Objects.hashCode(name);
   }
 }

prometheus-metrics-model/src/test/java/io/prometheus/metrics/model/snapshots/UnitTest.java

@@ -43,4 +43,13 @@ void testEquals4() {
 
     assertThat(unit1).isEqualTo(unit2);
   }
+
+  @Test
+  void testEqualUnitsHaveEqualHashCodes() {
+    Unit unit1 = new Unit(" bytes ");
+    Unit unit2 = new Unit("bytes");
+
+    assertThat(unit1).isEqualTo(unit2);
+    assertThat(unit1.hashCode()).isEqualTo(unit2.hashCode());
+  }
 }