Remove wildcard of SkyFunctionName, as it is final

Nothing can extend SkyFunctionName. It's final.

--
MOS_MIGRATED_REVID=105989976

src/main/java/com/google/devtools/build/skyframe/ParallelEvaluator.java

diff --git a/src/main/java/com/google/devtools/build/skyframe/ParallelEvaluator.java b/src/main/java/com/google/devtools/build/skyframe/ParallelEvaluator.java
index 9c8f00b..a7c7aee 100644
--- a/src/main/java/com/google/devtools/build/skyframe/ParallelEvaluator.java
+++ b/src/main/java/com/google/devtools/build/skyframe/ParallelEvaluator.java
@@ -136,7 +136,7 @@
     void accept(T object);
   }
 
-  private final ImmutableMap<? extends SkyFunctionName, ? extends SkyFunction> skyFunctions;
+  private final ImmutableMap<SkyFunctionName, ? extends SkyFunction> skyFunctions;
 
   private final EventHandler reporter;
   private final NestedSetVisitor<TaggedEvents> replayingNestedSetEventVisitor;
@@ -152,7 +152,7 @@
   public ParallelEvaluator(
       ProcessableGraph graph,
       Version graphVersion,
-      ImmutableMap<? extends SkyFunctionName, ? extends SkyFunction> skyFunctions,
+      ImmutableMap<SkyFunctionName, ? extends SkyFunction> skyFunctions,
       final EventHandler reporter,
       EmittedEventState emittedEventState,
       EventFilter storedEventFilter,