[VOL-5442] Update Go module dependencies in rw-core.

Change-Id: Ic1bb524d9b5e57eb77b06b4129204b89cc90176d
Signed-off-by: mgouda <madhumati.gouda@radisys.com>
diff --git a/vendor/golang.org/x/net/http2/write.go b/vendor/golang.org/x/net/http2/write.go
index 33f6139..fdb35b9 100644
--- a/vendor/golang.org/x/net/http2/write.go
+++ b/vendor/golang.org/x/net/http2/write.go
@@ -13,6 +13,7 @@
 
 	"golang.org/x/net/http/httpguts"
 	"golang.org/x/net/http2/hpack"
+	"golang.org/x/net/internal/httpcommon"
 )
 
 // writeFramer is implemented by any type that is used to write frames.
@@ -131,6 +132,16 @@
 
 func (se StreamError) staysWithinBuffer(max int) bool { return frameHeaderLen+4 <= max }
 
+type writePing struct {
+	data [8]byte
+}
+
+func (w writePing) writeFrame(ctx writeContext) error {
+	return ctx.Framer().WritePing(false, w.data)
+}
+
+func (w writePing) staysWithinBuffer(max int) bool { return frameHeaderLen+len(w.data) <= max }
+
 type writePingAck struct{ pf *PingFrame }
 
 func (w writePingAck) writeFrame(ctx writeContext) error {
@@ -341,7 +352,7 @@
 	}
 	for _, k := range keys {
 		vv := h[k]
-		k, ascii := lowerHeader(k)
+		k, ascii := httpcommon.LowerHeader(k)
 		if !ascii {
 			// Skip writing invalid headers. Per RFC 7540, Section 8.1.2, header
 			// field names have to be ASCII characters (just as in HTTP/1.x).