Update GitHub Actions CI Go matrix for Go v1.22

This change adds Go v1.22 to the GitHub Actions CI matrix and drops Go
v1.19 and v1.20 which would no longer receive updates. Also it updates
the golangci-lint version to v1.56 which adds support for Go v1.22.

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

.github/workflows/validate.yml

@@ -33,11 +33,11 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v4
         with:
-          go-version: 1.21.x
+          go-version: 1.22.x
           cache: false # golangci-lint-action does its own caching
       - uses: golangci/golangci-lint-action@v3
         with:
-          version: v1.54
+          version: v1.56
 
   codespell:
     runs-on: ubuntu-22.04
@@ -62,19 +62,19 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v4
         with:
-          go-version: 1.21.x
+          go-version: 1.22.x
           cache: false # golangci-lint-action does its own caching
       - uses: golangci/golangci-lint-action@v3
         with:
-          version: v1.54
+          version: v1.56
       - name: test-stubs
         run: make test
 
   test:
     strategy:
       fail-fast: false
       matrix:
-        go-version: [1.19.x, 1.20.x, 1.21.x]
+        go-version: [1.21.x, 1.22.x]
         race: ["-race", ""]
     runs-on: ubuntu-20.04
     steps: