Ensure forward compatibility with ipl-sql by adding return types (#269)

Add explicit return types to `ipl-sql`-derived methods to prepare for strict
typing. These additions are safe, as they only annotate existing methods that
previously lacked return type declarations.

Author: sukhwinder33445

library/Reporting/RetryConnection.php

@@ -5,15 +5,17 @@
 
 namespace Icinga\Module\Reporting;
 
+use Exception;
 use ipl\Sql\Connection;
+use PDOStatement;
 
 class RetryConnection extends Connection
 {
-    public function prepexec($stmt, $values = null)
+    public function prepexec($stmt, $values = null): PDOStatement
     {
         try {
             $sth = parent::prepexec($stmt, $values);
-        } catch (\Exception $e) {
+        } catch (Exception $e) {
             $lostConnection = Str::contains($e->getMessage(), [
                 'server has gone away',
                 'no connection to the server',
@@ -45,7 +47,7 @@ public function prepexec($stmt, $values = null)
 
             try {
                 $this->connect();
-            } catch (\Exception $e) {
+            } catch (Exception $e) {
                 $noConnection = Str::contains($e->getMessage(), [
                     'No such file or directory',
                     'Connection refused'
@@ -55,7 +57,7 @@ public function prepexec($stmt, $values = null)
                     throw $e;
                 }
 
-                \sleep(10);
+                sleep(10);
 
                 $this->connect();
             }