chore(deps): update gradle/actions action to v4 (#4595)

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

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [gradle/actions](https://togithub.com/gradle/actions) | action | major
| `v3` -> `v4` |

---

### Release Notes

<details>
<summary>gradle/actions (gradle/actions)</summary>

### [`v4`](https://togithub.com/gradle/actions/compare/v3...v4)

[Compare Source](https://togithub.com/gradle/actions/compare/v3...v4)

</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 becomes conflicted, 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://www.mend.io/free-developer-tools/renovate/). View the
[repository job log](https://developer.mend.io/github/tuskyapp/Tusky).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy40NDAuNyIsInVwZGF0ZWRJblZlciI6IjM3LjQ0MC43IiwidGFyZ2V0QnJhbmNoIjoiZGV2ZWxvcCIsImxhYmVscyI6W119-->

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

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
           distribution: 'temurin'
 
       - name: Gradle Wrapper Validation
-        uses: gradle/actions/wrapper-validation@v3
+        uses: gradle/actions/wrapper-validation@v4
 
       - name: Copy CI gradle.properties
         run: mkdir -p ~/.gradle ; cp .github/ci-gradle.properties ~/.gradle/gradle.properties

.github/workflows/populate-gradle-build-cache.yml

@@ -21,7 +21,7 @@ jobs:
           distribution: 'temurin'
 
       - name: Gradle Wrapper Validation
-        uses: gradle/actions/wrapper-validation@v3
+        uses: gradle/actions/wrapper-validation@v4
 
       - name: Copy CI gradle.properties
         run: mkdir -p ~/.gradle ; cp .github/ci-gradle.properties ~/.gradle/gradle.properties