build: upgrade dependencies and build with go 1.21

vendor/github.com/testcontainers/testcontainers-go/exec/processor.go

@@ -0,0 +1,44 @@
+package exec
+
+import (
+	"bytes"
+	"io"
+
+	"github.com/docker/docker/pkg/stdcopy"
+)
+
+// ProcessOptions defines options applicable to the reader processor
+type ProcessOptions struct {
+	Reader io.Reader
+}
+
+// ProcessOption defines a common interface to modify the reader processor
+// These options can be passed to the Exec function in a variadic way to customize the returned Reader instance
+type ProcessOption interface {
+	Apply(opts *ProcessOptions)
+}
+
+type ProcessOptionFunc func(opts *ProcessOptions)
+
+func (fn ProcessOptionFunc) Apply(opts *ProcessOptions) {
+	fn(opts)
+}
+
+func Multiplexed() ProcessOption {
+	return ProcessOptionFunc(func(opts *ProcessOptions) {
+		done := make(chan struct{})
+
+		var outBuff bytes.Buffer
+		var errBuff bytes.Buffer
+		go func() {
+			if _, err := stdcopy.StdCopy(&outBuff, &errBuff, opts.Reader); err != nil {
+				return
+			}
+			close(done)
+		}()
+
+		<-done
+
+		opts.Reader = &outBuff
+	})
+}