go.mod: update go.mod for riscv64

Fixes golang/go#48355

Change-Id: I04d746dfe00bc4ef3e4281aca35441250dbf36c8
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/349589
Trust: Meng Zhuo <mzh@golangcn.org>
Trust: Jeremy Faller <jeremy@golang.org>
Run-TryBot: Meng Zhuo <mzh@golangcn.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
diff --git a/go.mod b/go.mod
index 0ab3dc9..2e6dd58 100644
--- a/go.mod
+++ b/go.mod
@@ -4,5 +4,5 @@
 
 require (
 	github.com/BurntSushi/toml v0.3.1
-	golang.org/x/sys v0.0.0-20190312061237-fead79001313
+	golang.org/x/sys v0.0.0-20210910150752-751e447fb3d0
 )
diff --git a/go.sum b/go.sum
index 77dcb62..e33e1b2 100644
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,4 @@
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-golang.org/x/sys v0.0.0-20190312061237-fead79001313 h1:pczuHS43Cp2ktBEEmLwScxgjWsBSzdaQiKzUyf3DTTc=
-golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210910150752-751e447fb3d0 h1:xrCZDmdtoloIiooiA9q0OQb9r8HejIHYoHGhGCe1pGg=
+golang.org/x/sys v0.0.0-20210910150752-751e447fb3d0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=