Update Go version to 1.19 in CI workflow and go.mod

Upgraded the Go version from 1.14 to 1.19 in the GitHub Actions workflow and go.mod file to ensure compatibility with the latest features and improvements. Also removed unnecessary environment variables in the test run command.

.github/workflows/unit-test.yml

@@ -16,10 +16,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.14
+    - name: Set up Go 1.19
       uses: actions/setup-go@v1
       with:
-        go-version: 1.14
+        go-version: 1.19
       id: go
 
     - name: Check out code into the Go module directory
@@ -33,4 +33,4 @@ jobs:
             dep ensure
         fi
     - name: Run test
-      run: CGO_ENABLED=1 GO111MODULE=on go test -v -race
+      run: go test -v -race

go.mod

@@ -2,4 +2,4 @@ module github.com/templexxx/xorsimd
 
 require github.com/templexxx/cpu v0.1.1
 
-go 1.14
+go 1.19