minor #262 Remove void from tests (OskarStark)

This PR was merged into the main branch.

Discussion
----------

Remove `void` from tests

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Docs?         | no
| Issues        | --
| License       | MIT

Commits
-------

f9f8769 Remove `void` from tests

Author: OskarStark

src/store/tests/Bridge/Neo4j/StoreTest.php

@@ -24,7 +24,7 @@
 #[CoversClass(Store::class)]
 final class StoreTest extends TestCase
 {
-    public function testStoreCannotInitializeOnInvalidResponse(): void
+    public function testStoreCannotInitializeOnInvalidResponse()
     {
         $httpClient = new MockHttpClient([
             new JsonMockResponse([], [
@@ -40,7 +40,7 @@ public function testStoreCannotInitializeOnInvalidResponse(): void
         $store->initialize();
     }
 
-    public function testStoreCanInitialize(): void
+    public function testStoreCanInitialize()
     {
         $httpClient = new MockHttpClient([
             new JsonMockResponse([
@@ -85,7 +85,7 @@ public function testStoreCanInitialize(): void
         $this->assertSame(2, $httpClient->getRequestsCount());
     }
 
-    public function testStoreCanAdd(): void
+    public function testStoreCanAdd()
     {
         $httpClient = new MockHttpClient([
             new JsonMockResponse([
@@ -164,7 +164,7 @@ public function testStoreCanAdd(): void
         $this->assertSame(3, $httpClient->getRequestsCount());
     }
 
-    public function testStoreCanQuery(): void
+    public function testStoreCanQuery()
     {
         $httpClient = new MockHttpClient([
             new JsonMockResponse([