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/build-kustomization/podinfo-result.yaml

@@ -143,8 +143,8 @@ metadata:
   name: secret-basic-auth-stringdata
   namespace: default
 stringData:
-  password: KipTT1BTKio=
-  username: KipTT1BTKio=
+  password: '**SOPS**'
+  username: '**SOPS**'
 type: kubernetes.io/basic-auth
 ---
 apiVersion: v1

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

@@ -2,5 +2,11 @@
 ► 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

cmd/flux/testdata/diff-kustomization/stringdata-sops-secret.yaml

@@ -8,5 +8,5 @@ metadata:
   namespace: default
 stringData:
   password: KipTT1BTKio=
-  username: KipTT1BTKio=
+  username1: KipTT1BTKio=
 type: kubernetes.io/basic-auth