Address some https://errorprone.info/bugpattern/UnnecessaryJavacSuppressWarnings warnings.

...again, having previously done so in 12bf71e.

Some remaining warnings came up in 0f05bb4.

RELNOTES=n/a
PiperOrigin-RevId: 843385402

Author: cpovirk

android/guava-tests/test/com/google/common/collect/MapsTest.java

@@ -1037,7 +1037,6 @@ public void testFromProperties() throws IOException {
 
   @J2ktIncompatible
   @GwtIncompatible // Maps.fromProperties
-  @SuppressWarnings("serial") // never serialized
   public void testFromPropertiesNullKey() {
     Properties properties =
         new Properties() {
@@ -1054,7 +1053,6 @@ public Enumeration<?> propertyNames() {
 
   @J2ktIncompatible
   @GwtIncompatible // Maps.fromProperties
-  @SuppressWarnings("serial") // never serialized
   public void testFromPropertiesNonStringKeys() {
     Properties properties =
         new Properties() {

android/guava-tests/test/com/google/common/primitives/BooleansTest.java

@@ -593,9 +593,11 @@ public void testAsListCanonicalValues() {
     List<Boolean> list = Booleans.asList(true, false);
     assertThat(list.get(0)).isSameInstanceAs(true);
     assertThat(list.get(1)).isSameInstanceAs(false);
-    @SuppressWarnings("deprecation")
+    // The constructor is deprecated only in some versions of java.lang.Boolean.
+    @SuppressWarnings({"deprecation", "UnnecessaryJavacSuppressWarnings"})
     Boolean anotherTrue = new Boolean(true);
-    @SuppressWarnings("deprecation")
+    // The constructor is deprecated only in some versions of java.lang.Boolean.
+    @SuppressWarnings({"deprecation", "UnnecessaryJavacSuppressWarnings"})
     Boolean anotherFalse = new Boolean(false);
     list.set(0, anotherTrue);
     assertThat(list.get(0)).isSameInstanceAs(true);

guava-tests/test/com/google/common/collect/MapsTest.java

@@ -1037,7 +1037,6 @@ public void testFromProperties() throws IOException {
 
   @J2ktIncompatible
   @GwtIncompatible // Maps.fromProperties
-  @SuppressWarnings("serial") // never serialized
   public void testFromPropertiesNullKey() {
     Properties properties =
         new Properties() {
@@ -1054,7 +1053,6 @@ public Enumeration<?> propertyNames() {
 
   @J2ktIncompatible
   @GwtIncompatible // Maps.fromProperties
-  @SuppressWarnings("serial") // never serialized
   public void testFromPropertiesNonStringKeys() {
     Properties properties =
         new Properties() {

guava-tests/test/com/google/common/primitives/BooleansTest.java

@@ -593,9 +593,11 @@ public void testAsListCanonicalValues() {
     List<Boolean> list = Booleans.asList(true, false);
     assertThat(list.get(0)).isSameInstanceAs(true);
     assertThat(list.get(1)).isSameInstanceAs(false);
-    @SuppressWarnings("deprecation")
+    // The constructor is deprecated only in some versions of java.lang.Boolean.
+    @SuppressWarnings({"deprecation", "UnnecessaryJavacSuppressWarnings"})
     Boolean anotherTrue = new Boolean(true);
-    @SuppressWarnings("deprecation")
+    // The constructor is deprecated only in some versions of java.lang.Boolean.
+    @SuppressWarnings({"deprecation", "UnnecessaryJavacSuppressWarnings"})
     Boolean anotherFalse = new Boolean(false);
     list.set(0, anotherTrue);
     assertThat(list.get(0)).isSameInstanceAs(true);