.github/workflows: upgrade actions

This requires updating to a more recent version of golangci-lint, which
has some new failures.  This removes those failing linters, and I'll
need to come back and look at those problems in a followup change.

.github/workflows/tests.yml

@@ -37,9 +37,9 @@ jobs:
     runs-on: ${{ matrix.platform }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@0aaccfd150d50ccaeb58ebd88d36e91967a5f35b # v5.4.0
         with:
           go-version: ${{ matrix.go-version }}
 
@@ -48,4 +48,4 @@ jobs:
 
       - name: Upload coverage to Codecov
         if: ${{ matrix.update-coverage }}
-        uses: codecov/codecov-action@5ecb98a3c6b747ed38dc09f787459979aebb39be # v4.3.1
+        uses: codecov/codecov-action@ad3126e916f78f00edff4ed0317cf185271ccc2d # v5.4.2