action.yml: update actions to latest versions

Update actions/checkout v3 -> 4.1.1, see
https://github.com/actions/checkout/compare/v3...v4.1.1 for changes.

Update actions/setup-go v4.0.0 -> v5.0.0, see
https://github.com/actions/setup-go/compare/v4.0.0...v5.0.0 for changes.

Change-Id: I8b37eb73efb3d2103e421fbbc29f32b5df8c3037
Reviewed-on: https://go-review.googlesource.com/c/govulncheck-action/+/554895
Reviewed-by: Zvonimir Pavlinovic <zpavlinovic@google.com>
Reviewed-by: Maceo Thompson <maceothompson@google.com>
Run-TryBot: Zvonimir Pavlinovic <zpavlinovic@google.com>
Commit-Queue: Zvonimir Pavlinovic <zpavlinovic@google.com>
TryBot-Bypass: Zvonimir Pavlinovic <zpavlinovic@google.com>
Commit-Queue: Tobias Klauser <tobias.klauser@gmail.com>
diff --git a/action.yml b/action.yml
index f256f6d..f827dc4 100644
--- a/action.yml
+++ b/action.yml
@@ -31,8 +31,8 @@
   using: "composite"
   steps:
     - if: inputs.repo-checkout != 'false' # only explicit false prevents repo checkout
-      uses: actions/checkout@v3
-    - uses: actions/setup-go@v4.0.0
+      uses: actions/checkout@v4.1.1
+    - uses: actions/setup-go@v5.0.0
       with:
         go-version: ${{ inputs.go-version-input }}
         check-latest: ${{ inputs.check-latest }}