.github/workflows: test with Go 1.23, 1.22

These are the currently supported major Go versions.

.github/workflows/main.yml

@@ -1,13 +1,12 @@
 name: Main
 on: [push, pull_request]
 jobs:
-
   tests:
     name: ${{matrix.go-version}} ${{matrix.os}}
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        go-version: [1.14, 1.16]
+        go-version: [1.23, 1.22]
         os: [macos-latest, windows-latest, ubuntu-latest]
     steps:
       - name: Install dependencies (linux)