Bump deps (#1885)

```
* use go 1.17 semantics in go.mod
* pin tonistiigi/fsutil dep to match docker/docker's dep
go get -u ./...
go mod vendor
```

vendor/github.com/aws/smithy-go/encoding/xml/constants.go

@@ -0,0 +1,10 @@
+package xml
+
+const (
+	leftAngleBracket  = '<'
+	rightAngleBracket = '>'
+	forwardSlash      = '/'
+	colon             = ':'
+	equals            = '='
+	quote             = '"'
+)