chore(deps): update actions/setup-go action to v5 (#692)

[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/setup-go](https://togithub.com/actions/setup-go) | action |
major | `v4` -> `v5` |

---

### Release Notes

<details>
<summary>actions/setup-go (actions/setup-go)</summary>

### [`v5`](https://togithub.com/actions/setup-go/compare/v4...v5)

[Compare Source](https://togithub.com/actions/setup-go/compare/v4...v5)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Mend
Renovate](https://www.mend.io/free-developer-tools/renovate/). View
repository job log
[here](https://developer.mend.io/github/GoogleCloudPlatform/document-ai-samples).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy44Ny4yIiwidXBkYXRlZEluVmVyIjoiMzcuODcuMiIsInRhcmdldEJyYW5jaCI6Im1haW4ifQ==-->

.github/workflows/go.yaml

@@ -20,7 +20,7 @@ jobs:
         working-directory: ./cx-content-moderation
     steps:
       - name: Setup Go
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
           go-version: "^1.20"
       - name: Checkout code
@@ -41,7 +41,7 @@ jobs:
         working-directory: ./cx-content-moderation
     steps:
       - name: Setup Go
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
           go-version: "^1.20"
       - name: Checkout code
@@ -69,7 +69,7 @@ jobs:
         working-directory: ./cx-content-moderation
     steps:
       - name: Setup Go
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
           go-version: "^1.20"
       - name: Checkout code
@@ -90,7 +90,7 @@ jobs:
         working-directory: ./cx-content-moderation
     steps:
       - name: Setup Go
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
           go-version: "^1.20"
       - name: Check code