Upgrade x/sys (#65)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 443b03e..855e594 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -19,8 +19,7 @@
 
     - name: Build
       run: |
-        go get -u golang.org/x/sys
-        GOOS=freebsd go build        
+        GOOS=freebsd go build
         GOOS=windows go build
         go build -v .
 
diff --git a/go.mod b/go.mod
index 5241305..16df7bf 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@
 
 go 1.14
 
-require golang.org/x/sys v0.0.0-20201101102859-da207088b7d1
+require golang.org/x/sys v0.0.0-20220408201424-a24fb2fb8a0f
diff --git a/go.sum b/go.sum
index 4e30b87..c444bb9 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,4 @@
 golang.org/x/sys v0.0.0-20201101102859-da207088b7d1 h1:a/mKvvZr9Jcc8oKfcmgzyp7OwF73JPWsQLvH1z2Kxck=
 golang.org/x/sys v0.0.0-20201101102859-da207088b7d1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20220408201424-a24fb2fb8a0f h1:8w7RhxzTVgUzw/AH/9mUV5q0vMgy40SQRursCcfmkCw=
+golang.org/x/sys v0.0.0-20220408201424-a24fb2fb8a0f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=