Update RegisteredToolchainsValue.Key to use @AutoCodec.Interner i…

…nstead of `@AutoCodec.Instantiator`.

PiperOrigin-RevId: 602403718
Change-Id: I3a64519c1d476763f121878f915f917c62cc5d1e

src/main/java/com/google/devtools/build/lib/skyframe/toolchains/RegisteredToolchainsValue.java

@@ -48,12 +48,16 @@ private Key(BuildConfigurationKey configurationKey) {
       this.configurationKey = configurationKey;
     }
 
-    @AutoCodec.Instantiator
-    @VisibleForSerialization
-    static Key of(BuildConfigurationKey configurationKey) {
+    private static Key of(BuildConfigurationKey configurationKey) {
       return interner.intern(new Key(configurationKey));
     }
 
+    @VisibleForSerialization
+    @AutoCodec.Interner
+    static Key intern(Key key) {
+      return interner.intern(key);
+    }
+
     @Override
     public SkyFunctionName functionName() {
       return SkyFunctions.REGISTERED_TOOLCHAINS;