retract v2.3.0 in v2.3.1 returning to go 1.21

There were compatibility issues with go 1.22.  This retracts release v2.3.0 which used go 1.22 and adds release v2.3.1 which goes back to using go 1.21.

Author: elrayle

README.md

@@ -1,5 +1,5 @@
-[![Go Reference](https://pkg.go.dev/badge/github.com/github/go-spdx/v2@v2.3.0/spdxexp.svg)](https://pkg.go.dev/github.com/github/go-spdx/v2@v2.3.0/spdxexp)
-[![Go Reference](https://pkg.go.dev/badge/github.com/github/go-spdx/v2@v2.3.0/spdxlicenses.svg)](https://pkg.go.dev/github.com/github/go-spdx/v2@v2.3.0/spdxlicenses)
+[![Go Reference](https://pkg.go.dev/badge/github.com/github/go-spdx/v2@v2.3.1/spdxexp.svg)](https://pkg.go.dev/github.com/github/go-spdx/v2@v2.3.1/spdxexp)
+[![Go Reference](https://pkg.go.dev/badge/github.com/github/go-spdx/v2@v2.3.1/spdxlicenses.svg)](https://pkg.go.dev/github.com/github/go-spdx/v2@v2.3.1/spdxlicenses)
 
 # go-spdx
 

go.mod

@@ -1,6 +1,8 @@
 module github.com/github/go-spdx/v2
 
-go 1.22
+retract v2.3.0 // Compatibility issues with go 1.22
+
+go 1.21
 
 require github.com/stretchr/testify v1.8.0