Reduce x/crypto and x/sys versions to match Go 1.20

CIRCL does not necessarily depend on newer x/crypto and x/sys versions.
Lower the version requirements to match Go 1.20.2, this avoids the need
to upgrade stdlib dependencies when integrating circl.

While at it, bump golangci-lint and drop Go 1.18 which is no longer
supported by Go developers.

.github/workflows/ci-actions.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        GOVER: ['1.20', '1.19', '1.18']
+        GOVER: ['1.20', '1.19']
     steps:
       - name: Setup Go-${{ matrix.GOVER }}
         uses: actions/setup-go@v3
@@ -24,7 +24,7 @@ jobs:
       - name: Linting
         uses: golangci/golangci-lint-action@v3
         with:
-          version: v1.51
+          version: v1.51.2
           args: --config=./.etc/golangci.yml ./...
       - name: Check shadowing
         run: |

go.mod

@@ -1,9 +1,9 @@
 module github.com/cloudflare/circl
 
-go 1.18
+go 1.19
 
 require (
 	github.com/bwesterb/go-ristretto v1.2.2
-	golang.org/x/crypto v0.7.0
-	golang.org/x/sys v0.6.0
+	golang.org/x/crypto v0.3.1-0.20221117191849-2c476679df9a
+	golang.org/x/sys v0.3.0
 )

go.sum

@@ -1,6 +1,6 @@
 github.com/bwesterb/go-ristretto v1.2.2 h1:S2C0mmSjCLS3H9+zfXoIoKzl+cOncvBvt6pE+zTm5Ms=
 github.com/bwesterb/go-ristretto v1.2.2/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
-golang.org/x/crypto v0.7.0 h1:AvwMYaRytfdeVt3u6mLaxYtErKYjxA2OXjJ1HHq6t3A=
-golang.org/x/crypto v0.7.0/go.mod h1:pYwdfH91IfpZVANVyUOhSIPZaFoJGxTFbZhFTx+dXZU=
-golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
-golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/crypto v0.3.1-0.20221117191849-2c476679df9a h1:diz9pEYuTIuLMJLs3rGDkeaTsNyRs6duYdFyPAxzE/U=
+golang.org/x/crypto v0.3.1-0.20221117191849-2c476679df9a/go.mod h1:hebNnKkNXi2UzZN1eVRvBB7co0a+JxK6XbPiWVs/3J4=
+golang.org/x/sys v0.3.0 h1:w8ZOecv6NaNa/zC8944JTU3vz4u6Lagfk4RPQxv92NQ=
+golang.org/x/sys v0.3.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=