chore(deps): update actions/setup-dotnet action to v4 (#930)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[actions/setup-dotnet](https://redirect.github.com/actions/setup-dotnet)
| action | major | `v3` -> `v4` |

---

### Release Notes

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

###
[`v4`](https://redirect.github.com/actions/setup-dotnet/compare/v3...v4)

[Compare
Source](https://redirect.github.com/actions/setup-dotnet/compare/v3...v4)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "after 9pm,before 6am" in timezone
Europe/Zurich, Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **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 was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/dotnet/dotnet-operator-sdk).

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/dotnet-pre-release.yml

@@ -21,7 +21,7 @@ jobs:
           fetch-depth: 1
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v3
+        uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 9.x
 

.github/workflows/dotnet-release.yml

@@ -20,7 +20,7 @@ jobs:
           fetch-depth: 1
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v3
+        uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 9.x
 

.github/workflows/dotnet-test.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v3
+        uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 9.x
 

.github/workflows/security-analysis.yml

@@ -31,7 +31,7 @@ jobs:
           languages: csharp
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v3
+        uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 9.x