Remove the fixed patch version for Go

Removed the old hack added for releasing k6 v0.41.0 with a specific
version.

Author: codebien

.github/workflows/build.yml

@@ -26,7 +26,7 @@ env:
   LI_DOCKER_IMAGE_ID: "loadimpact/k6"
   DOCKER_IMAGE_ID: "grafana/k6"
   GHCR_IMAGE_ID: ${{ github.repository }}
-  DEFAULT_GO_VERSION: "1.19.3"
+  DEFAULT_GO_VERSION: "1.19.x"
 
 jobs:
   configure: