Dockerfile: update golangci-lint to 1.48.0 (go 1.19 support)

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

hack/dockerfiles/lint.Dockerfile

@@ -4,7 +4,7 @@ ARG GO_VERSION=1.19
 
 FROM golang:${GO_VERSION}-alpine
 RUN apk add --no-cache git gcc musl-dev
-RUN wget -O- -nv https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s v1.45.2
+RUN wget -O- -nv https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s v1.48.0
 WORKDIR /go/src/github.com/docker/buildx
 RUN --mount=target=/go/src/github.com/docker/buildx --mount=target=/root/.cache,type=cache \
   golangci-lint run

util/userfunc/doc.go

@@ -7,10 +7,10 @@
 //
 // The function declaration syntax looks like this:
 //
-//     function "foo" {
-//       params = ["name"]
-//       result = "Hello, ${name}!"
-//     }
+//	function "foo" {
+//	  params = ["name"]
+//	  result = "Hello, ${name}!"
+//	}
 //
 // When a user-defined function is called, the expression given for the "result"
 // attribute is evaluated in an isolated evaluation context that defines variables