GitHub actions updated, some PHP errors fixed

This PR contains:

- Ci actions (build) refactoring
- Little `Makefile` fix (my mistake in previous PR)
- Updated minimal required versions of composer packages:
  - `psr/http-factory` (`^1.0` → `^1.0.1`)
  - `psr/http-message` (`^1.0` → `^1.0.1`)
  - `laminas/laminas-diactoros` (`^1.3` → `^1.3.6`)
- Tests using minimal and maximal composer package versions
- Disabling `checkMissingIterableValueType` in `phpstan.neon.dist`
- Some typos (wrong class namespaces and annotations) in PHP files :warning: 
- One improvement in `HttpClient::respond` method (variable type hint overriding fixed)
- Added packages testing on CI:
  - `./service/gzip`
  - `./service/reload`

1 files changed, 4 insertions, 5 deletions

diff --git a/src/HttpClient.php b/src/HttpClient.php
index 4ca152c8..9b9048ca 100644
--- a/src/HttpClient.php
+++ b/src/HttpClient.php
@@ -62,14 +62,13 @@ final class HttpClient
      */
     public function respond(int $status, string $body, array $headers = []): void
     {
-        if (empty($headers)) {
-            // this is required to represent empty header set as map and not as array
-            $headers = new \stdClass();
-        }
+        $sendHeaders = empty($headers)
+            ? new \stdClass() // this is required to represent empty header set as map and not as array
+            : $headers;
 
         $this->getWorker()->send(
             $body,
-            (string) json_encode(['status' => $status, 'headers' => $headers])
+            (string) json_encode(['status' => $status, 'headers' => $sendHeaders])
         );
     }
 }