github: let's see if we can still build for go1.16 and go1.17

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

.github/workflows/go.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: ['1.18', '1.19', '1.20', '1.21']
+        go: ['1.16', '1.17', '1.18', '1.19', '1.20', '1.21']
     steps:
     - uses: actions/checkout@v3