Bump Go version to v1.22 (#33)

Increases min version to 1.20 and latest to v1.22.

.github/workflows/ci.yaml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: [1.19.x, 1.20.x, 1.21.x]
+        go-version: [1.20.x, 1.21.x, 1.22.x]
     steps:
       - name: Checkout Code
         uses: actions/checkout@v4
@@ -32,5 +32,5 @@ jobs:
         # conflicting guidance, run only on the most recent supported version.
         # For the same reason, only check generated code on the most recent
         # supported version.
-        if: matrix.go-version == '1.21.x'
+        if: matrix.go-version == '1.22.x'
         run: make checkgenerate && make lint

go.mod

@@ -1,6 +1,6 @@
 module github.com/bufbuild/protoyaml-go
 
-go 1.19
+go 1.20
 
 require (
 	github.com/bufbuild/protovalidate-go v0.4.0