Pin version of Azure/go-autorest to > v12.0.1

* This version split the library into many mini-modules
* Having some of our upstream dependencies use an older version
led to `ambiguos import` errors, where `go-autorest/autorest` was
found in both `go-autorest v11.1.2` and `go-autorest/autorestv0.9.3`
* See issue in autorest repo: Azure/go-autorest#414
* In the future we want to remove the `replace` workaround as this is
a bad pattern; ideally all dependencies would be using newer (v12.0.1+) versions
of autorest.

Co-authored-by: Sannidhi Jalukar <sjalukar@pivotal.io>
Co-authored-by: Renee Chu <rchu@pivotal.io>

src/capi-kpack-watcher/go.mod

@@ -20,3 +20,5 @@ require (
 	k8s.io/api v0.17.4
 	k8s.io/client-go v0.17.4
 )
+
+replace github.com/Azure/go-autorest => github.com/Azure/go-autorest v13.0.0+incompatible