Update for Go 1.21 (#575)

Enable CI testing of Go 1.21.
* Bump Go modules.

Signed-off-by: SuperQ <superq@gmail.com>

Author: SuperQ

.circleci/config.yml

@@ -4,7 +4,7 @@ version: 2.1
 jobs:
   lint:
     docker:
-    - image: cimg/go:1.20
+    - image: cimg/go:1.21
     steps:
     - checkout
     - run: make check_license
@@ -48,6 +48,7 @@ workflows:
             go_version:
             - "1.19"
             - "1.20"
+            - "1.21"
     - test:
         name: test-windows
         os: windows
@@ -57,3 +58,4 @@ workflows:
             go_version:
             - "1.19"
             - "1.20"
+            - "1.21"

go.mod

@@ -5,5 +5,5 @@ go 1.19
 require (
 	github.com/google/go-cmp v0.5.9
 	golang.org/x/sync v0.3.0
-	golang.org/x/sys v0.11.0
+	golang.org/x/sys v0.12.0
 )

go.sum

@@ -2,5 +2,5 @@ github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 golang.org/x/sync v0.3.0 h1:ftCYgMx6zT/asHUrPw8BLLscYtGznsLAnjq5RH9P66E=
 golang.org/x/sync v0.3.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
-golang.org/x/sys v0.11.0 h1:eG7RXZHdqOJ1i+0lgLgCpSXAp6M3LYlAo6osgSi0xOM=
-golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o=
+golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=