chore: update GitHub Actions

Author: twpayne

.github/workflows/main.yml

@@ -18,8 +18,8 @@ jobs:
         - oldstable
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-    - uses: actions/setup-go@0aaccfd150d50ccaeb58ebd88d36e91967a5f35b
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+    - uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00
       with:
         go-version: ${{ matrix.go-version }}
     - name: build
@@ -29,7 +29,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-    - uses: golangci/golangci-lint-action@1481404843c368bc19ca9406f87d6e0fc97bdcfd
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+    - uses: golangci/golangci-lint-action@4afd733a84b1f43292c63897423277bb7f4313a9
       with:
         version: v2.0.2