Update to WALA 1.6.2 (#798)

We use a [new WALA feature](wala/WALA#1286) to
only include the `java.base` module in the `AnalysisScope` used for
JarInfer. JarInfer does not require all JDK standard library modules to
be part of the analysis scope, just enough to make a valid class
hierarchy, and `java.base` suffices. This should speed up runs of
JarInfer, and in particular it speeds up our JarInfer regression tests.

gradle/dependencies.gradle

@@ -48,7 +48,7 @@ def versions = [
     // The version of Error Prone that NullAway is compiled and tested against
     errorProneApi          : errorProneVersionToCompileAgainst,
     support                : "27.1.1",
-    wala                   : "1.6.1",
+    wala                   : "1.6.2",
     commonscli             : "1.4",
     autoValue              : "1.10.2",
     autoService            : "1.1.1",

jar-infer/jar-infer-lib/src/main/java/com/uber/nullaway/jarinfer/DefinitelyDerefedParamsDriver.java

@@ -228,7 +228,7 @@ private void analyzeFile(String pkgName, String inPath, boolean includeNonPublic
     } else if (!new File(inPath).exists()) {
       return;
     }
-    AnalysisScope scope = AnalysisScopeReader.instance.makePrimordialScope(null);
+    AnalysisScope scope = AnalysisScopeReader.instance.makeBasePrimordialScope(null);
     scope.setExclusions(
         new FileOfClasses(
             new ByteArrayInputStream(DEFAULT_EXCLUSIONS.getBytes(StandardCharsets.UTF_8))));