[java] Add JSpecify annotations to Color class (Issue #14291) (#16626)

* [java] Add JSpecify annotations to Color class

Author: spencerarq

java/src/org/openqa/selenium/support/BUILD.bazel

@@ -35,6 +35,7 @@ java_export(
         "//java/src/org/openqa/selenium/support/ui:components",
         "//java/src/org/openqa/selenium/support/ui:elements",
         "//java/src/org/openqa/selenium/support/ui:wait",
+        artifact("org.jspecify:jspecify"),
     ],
 )
 

java/src/org/openqa/selenium/support/Color.java

@@ -20,7 +20,10 @@
 import java.util.Locale;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
 
+@NullMarked
 public class Color {
   private final int red;
   private final int green;
@@ -122,7 +125,7 @@ public int hashCode() {
   }
 
   private abstract static class Converter {
-    public Color getColor(String value) {
+    public @Nullable Color getColor(String value) {
       Matcher matcher = getPattern().matcher(value);
       if (matcher.find()) {
         double a = 1.0;