Fix stringData Secret issue

This commit migrate to the last version of pkg/ssa v0.14.1 that contains a fix
for stringData secrets. The test case was changed accordingly to
    validate a stringData drift.

A progress-bar flag option has also been added in order to be able to
disable it.

Signed-off-by: Soule BA <soule@weave.works>

cmd/flux/testdata/diff-kustomization/diff-with-drifted-stringdata-sops-secret.golden

@@ -0,0 +1,12 @@
+► Deployment/default/podinfo created
+► HorizontalPodAutoscaler/default/podinfo created
+► Service/default/podinfo created
+► Secret/default/docker-secret created
+► Secret/default/secret-basic-auth-stringdata drifted
+
+data
+  - one map entry removed:     + one map entry added:
+    username1: "*****"           username: "*****"
+
+► Secret/default/podinfo-token-77t89m9b67 created
+► Secret/default/db-user-pass-bkbd782d2c created