Add missing JSpecify @nullable (#179)

Author: rbygrave

avaje-config/src/main/java/io/avaje/config/InitialLoadContext.java

@@ -1,6 +1,7 @@
 package io.avaje.config;
 
 import io.avaje.config.CoreEntry.CoreMap;
+import org.jspecify.annotations.Nullable;
 
 import java.io.*;
 import java.lang.System.Logger.Level;
@@ -81,6 +82,7 @@ static String podService(String podName) {
   /**
    * Return the input stream (maybe null) for the given source.
    */
+  @Nullable
   InputStream resource(String resourcePath, InitialLoader.Source source) {
     InputStream is = null;
     if (source == InitialLoader.Source.RESOURCE) {

avaje-config/src/main/java/io/avaje/config/InitialLoader.java

@@ -197,8 +197,7 @@ private void loadViaIndirection() {
     }
   }
 
-  @Nullable
-  private String[] profiles() {
+  private String@Nullable[] profiles() {
     final String paths = loadContext.profiles();
     return paths == null ? null : splitPaths(paths);
   }
@@ -321,6 +320,7 @@ boolean loadProperties(String resourcePath, Source source) {
     return false;
   }
 
+  @Nullable
   private InputStream resource(String resourcePath, Source source) {
     return loadContext.resource(resourcePath, source);
   }