Bump deps

```
* 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/xanzy/ssh-agent/README.md

@@ -16,7 +16,7 @@ If you have an issue: report it on the [issue tracker](https://github.com/xanzy/
 
 ## Author
 
-Sander van Harmelen (<sander@xanzy.io>)
+Sander van Harmelen (<sander@vanharmelen.nl>)
 
 ## License
 

vendor/github.com/xanzy/ssh-agent/go.mod

@@ -1,6 +0,0 @@
-module github.com/xanzy/ssh-agent
-
-require (
-	golang.org/x/crypto v0.0.0-20190219172222-a4c6cb3142f2
-	golang.org/x/sys v0.0.0-20190221075227-b4e8571b14e0 // indirect
-)

vendor/github.com/xanzy/ssh-agent/go.sum

@@ -1,4 +0,0 @@
-golang.org/x/crypto v0.0.0-20190219172222-a4c6cb3142f2 h1:NwxKRvbkH5MsNkvOtPZi3/3kmI8CAzs3mtv+GLQMkNo=
-golang.org/x/crypto v0.0.0-20190219172222-a4c6cb3142f2/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/sys v0.0.0-20190221075227-b4e8571b14e0 h1:bzeyCHgoAyjZjAhvTpks+qM7sdlh4cCSitmXeCEO3B4=
-golang.org/x/sys v0.0.0-20190221075227-b4e8571b14e0/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=

vendor/github.com/xanzy/ssh-agent/pageant_windows.go

@@ -69,9 +69,6 @@ func winAPI(dllName, funcName string) func(...uintptr) (uintptr, uintptr, error)
 	return func(a ...uintptr) (uintptr, uintptr, error) { return proc.Call(a...) }
 }
 
-// Available returns true if Pageant is running
-func Available() bool { return pageantWindow() != 0 }
-
 // Query sends message msg to Pageant and returns response or error.
 // 'msg' is raw agent request with length prefix
 // Response is raw agent response with length prefix

vendor/github.com/xanzy/ssh-agent/sshagent_windows.go

@@ -27,17 +27,40 @@ import (
 	"net"
 	"sync"
 
+	"github.com/Microsoft/go-winio"
 	"golang.org/x/crypto/ssh/agent"
 )
 
+const (
+	sshAgentPipe = `\\.\pipe\openssh-ssh-agent`
+)
+
+// Available returns true if Pageant is running
+func Available() bool {
+	if pageantWindow() != 0 {
+		return true
+	}
+	conn, err := winio.DialPipe(sshAgentPipe, nil)
+	if err != nil {
+		return false
+	}
+	conn.Close()
+	return true
+}
+
 // New returns a new agent.Agent and the (custom) connection it uses
 // to communicate with a running pagent.exe instance (see README.md)
 func New() (agent.Agent, net.Conn, error) {
-	if !Available() {
-		return nil, nil, errors.New("SSH agent requested but Pageant not running")
+	if pageantWindow() != 0 {
+		return agent.NewClient(&conn{}), nil, nil
 	}
-
-	return agent.NewClient(&conn{}), nil, nil
+	conn, err := winio.DialPipe(sshAgentPipe, nil)
+	if err != nil {
+		return nil, nil, errors.New(
+			"SSH agent requested, but could not detect Pageant or Windows native SSH agent",
+		)
+	}
+	return agent.NewClient(conn), nil, nil
 }
 
 type conn struct {