properly set minimum go version to 1.22 (crewjam#604)

Author: crewjam

.github/workflows/test.yml

@@ -16,4 +16,5 @@ jobs:
       - uses: actions/setup-go@v4
         with:
           go-version: ${{ matrix.go }}
+      - run: go version
       - run: go test -v ./...

go.mod

@@ -2,8 +2,6 @@ module github.com/crewjam/saml
 
 go 1.22
 
-toolchain go1.24.2
-
 require (
 	github.com/beevik/etree v1.5.0
 	github.com/golang-jwt/jwt/v4 v4.5.2