Update dependencies/vendor (#1659)

vendor/github.com/mattermost/logr/v2/buffer.go

@@ -0,0 +1,28 @@
+package logr
+
+import (
+	"bytes"
+	"sync"
+)
+
+// Buffer provides a thread-safe buffer useful for logging to memory in unit tests.
+type Buffer struct {
+	buf bytes.Buffer
+	mux sync.Mutex
+}
+
+func (b *Buffer) Read(p []byte) (n int, err error) {
+	b.mux.Lock()
+	defer b.mux.Unlock()
+	return b.buf.Read(p)
+}
+func (b *Buffer) Write(p []byte) (n int, err error) {
+	b.mux.Lock()
+	defer b.mux.Unlock()
+	return b.buf.Write(p)
+}
+func (b *Buffer) String() string {
+	b.mux.Lock()
+	defer b.mux.Unlock()
+	return b.buf.String()
+}