update test chart to helm3 format

Signed-off-by: Jon Leonard <jgleonard@gmail.com>

cmd/helm/testdata/testcharts/chart-with-subchart-notes/Chart.yaml

@@ -1,4 +1,7 @@
-apiVersion: v1
+apiVersion: v2
 description: Chart with subchart notes
 name: chart-with-subchart-notes
 version: 0.0.1
+dependencies:
+  - name: subchart-with-notes
+    version: 0.0.1

cmd/helm/testdata/testcharts/chart-with-subchart-notes/charts/subchart-with-notes/Chart.yaml

@@ -1,4 +1,4 @@
-apiVersion: v1
+apiVersion: v2
 description: Subchart with notes
 name: subchart-with-notes
 version: 0.0.1

cmd/helm/testdata/testcharts/chart-with-subchart-notes/requirements.yaml

@@ -1,3 +0,0 @@
-dependencies:
-  - name: subchart-with-notes
-    version: 0.0.1