Merge pull request firecracker-microvm#354 from kzys/drop-old-go-versions

Drop Go 1.11 and 1.12

Author: kzys

.github/workflows/go.yml

@@ -11,8 +11,8 @@ jobs:
   build:
     strategy:
       matrix:
-        go: ['1.11', '1.12', '1.13', '1.14', '1.15', '1.16']
-        os: ['ubuntu-20.04']
+        go: ['1.13', '1.14', '1.15', '1.16', '1.17']
+        os: ['ubuntu-18.04', 'ubuntu-20.04']
       fail-fast: false
     name: ${{ matrix.os }} / Go ${{ matrix.go }}
     runs-on: ${{ matrix.os }}