Add Go 1.20, require Go 1.19, drop Go 1.18

Signed-off-by: Austin Vazquez <macedonv@amazon.com>

.github/workflows/test.yml

@@ -23,13 +23,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: [1.18.x, 1.19.x]
+        go-version: [1.19.x, 1.20.x]
         rootless: ["rootless", ""]
         race: ["-race", ""]
         criu: [""]
         include:
           # Also test against latest criu-dev
-          - go-version: 1.18.x
+          - go-version: 1.19.x
             rootless: ""
             race: ""
             criu: "criu-dev"

.github/workflows/validate.yml

@@ -8,7 +8,7 @@ on:
       - release-*
   pull_request:
 env:
-  GO_VERSION: 1.19.x
+  GO_VERSION: 1.20.x
 permissions:
   contents: read
 
@@ -32,7 +32,7 @@ jobs:
           sudo apt -q install libseccomp-dev
       - uses: golangci/golangci-lint-action@v3
         with:
-          version: v1.48
+          version: v1.51
       # Extra linters, only checking new code from a pull request.
       - name: lint-extra
         if: github.event_name == 'pull_request'