Remove usages of "whitelist" in Firestore.

Author: wilhuff

firebase-firestore/src/main/java/com/google/firebase/firestore/remote/AbstractStream.java

@@ -86,20 +86,20 @@ public void onHeaders(Metadata headers) {
       dispatcher.run(
           () -> {
             if (Logger.isDebugEnabled()) {
-              Map<String, String> whitelistedHeaders = new HashMap<>();
+              Map<String, String> allowlistedHeaders = new HashMap<>();
               for (String header : headers.keys()) {
                 if (Datastore.WHITE_LISTED_HEADERS.contains(header.toLowerCase(Locale.ENGLISH))) {
-                  whitelistedHeaders.put(
+                  allowlistedHeaders.put(
                       header,
                       headers.get(Metadata.Key.of(header, Metadata.ASCII_STRING_MARSHALLER)));
                 }
               }
-              if (!whitelistedHeaders.isEmpty()) {
+              if (!allowlistedHeaders.isEmpty()) {
                 Logger.debug(
                     AbstractStream.this.getClass().getSimpleName(),
                     "(%x) Stream received headers: %s",
                     System.identityHashCode(AbstractStream.this),
-                    whitelistedHeaders);
+                    allowlistedHeaders);
               }
             }
           });