Upgrade minimum supported go version to 1.21 (#129)

* feat: upgrade to go 1.20

* feat: switch to go 1.21

Author: bahkauv70

README.md

@@ -8,7 +8,7 @@ Currently only generation of Go libraries are supported. The output is stored in
 
 If you want to modify script or templates and you can run code locally.
 
-Requires `Go 1.20` or higher.
+Requires `Go 1.21` or higher.
 
 1. Set up the project and tools by running
    ```

scripts/generate-sdk/languages/go.sh

@@ -8,15 +8,15 @@ SDK_REPO_LOCAL_PATH="${ROOT_DIR}/sdk-repo-updated"
 
 OAS_REPO=https://github.com/stackitcloud/stackit-api-specifications
 
-SDK_GO_VERSION="1.18"
+SDK_GO_VERSION="1.21"
 
 SERVICES_FOLDER="${SDK_REPO_LOCAL_PATH}/services"
 EXAMPLES_FOLDER="${SDK_REPO_LOCAL_PATH}/examples"
 SCRIPTS_FOLDER="${SDK_REPO_LOCAL_PATH}/scripts"
 
 GENERATOR_LOG_LEVEL="error" # Must be a Java log level (error, warn, info...)
 
-SDK_GO_VERSION="1.18"
+SDK_GO_VERSION="1.21"
 
 generate_go_sdk() {
     # Required parameters

templates/go/go.mod.mustache

@@ -1,6 +1,6 @@
 module {{gitHost}}/{{gitUserId}}/{{gitRepoId}}/services{{#isGoSubmodule}}/{{packageName}}{{/isGoSubmodule}}
 
-go 1.18
+go 1.21
 
 require (
 	{{gitHost}}/{{gitUserId}}/{{gitRepoId}}/core v0.15.1