Fixed some PHPStan level 5 issues

src/Entity/Parts/PartTraits/BasicPropertyTrait.php

@@ -66,7 +66,7 @@ trait BasicPropertyTrait
     #[Assert\NotNull(message: 'validator.select_valid_category')]
     #[Selectable()]
     #[Groups(['simple', 'extended', 'full', 'import'])]
-    #[ORM\ManyToOne(targetEntity: 'Category')]
+    #[ORM\ManyToOne(targetEntity: Category::class)]
     #[ORM\JoinColumn(name: 'id_category', nullable: false)]
     protected ?Category $category = null;
 
@@ -74,7 +74,7 @@ trait BasicPropertyTrait
      * @var Footprint|null The footprint of this part (e.g. DIP8)
      */
     #[Groups(['simple', 'extended', 'full', 'import'])]
-    #[ORM\ManyToOne(targetEntity: 'Footprint')]
+    #[ORM\ManyToOne(targetEntity: Footprint::class)]
     #[ORM\JoinColumn(name: 'id_footprint')]
     #[Selectable()]
     protected ?Footprint $footprint = null;

src/Entity/Parts/PartTraits/InstockTrait.php

@@ -40,7 +40,7 @@ trait InstockTrait
      */
     #[Assert\Valid]
     #[Groups(['extended', 'full', 'import'])]
-    #[ORM\OneToMany(targetEntity: 'PartLot', mappedBy: 'part', cascade: ['persist', 'remove'], orphanRemoval: true)]
+    #[ORM\OneToMany(targetEntity: PartLot::class, mappedBy: 'part', cascade: ['persist', 'remove'], orphanRemoval: true)]
     #[ORM\OrderBy(['amount' => 'DESC'])]
     protected Collection $partLots;
 
@@ -57,7 +57,7 @@ trait InstockTrait
      * @var ?MeasurementUnit the unit in which the part's amount is measured
      */
     #[Groups(['extended', 'full', 'import'])]
-    #[ORM\ManyToOne(targetEntity: 'MeasurementUnit')]
+    #[ORM\ManyToOne(targetEntity: MeasurementUnit::class)]
     #[ORM\JoinColumn(name: 'id_part_unit')]
     protected ?MeasurementUnit $partUnit = null;
 

src/Entity/Parts/PartTraits/ManufacturerTrait.php

@@ -39,7 +39,7 @@ trait ManufacturerTrait
      * @var Manufacturer|null The manufacturer of this part
      */
     #[Groups(['simple', 'extended', 'full', 'import'])]
-    #[ORM\ManyToOne(targetEntity: 'Manufacturer')]
+    #[ORM\ManyToOne(targetEntity: Manufacturer::class)]
     #[ORM\JoinColumn(name: 'id_manufacturer')]
     #[Selectable()]
     protected ?Manufacturer $manufacturer = null;

src/Entity/Parts/PartTraits/OrderTrait.php

@@ -98,7 +98,7 @@ trait OrderTrait
      *
      * @param bool $hide_obsolete If true, obsolete orderdetails will NOT be returned
      *
-     * @return Collection|Orderdetail[] * all orderdetails as a one-dimensional array of Orderdetails objects
+     * @return Collection<int, Orderdetail> * all orderdetails as a one-dimensional array of Orderdetails objects
      *                                  (empty array if there are no ones)
      *                                  * the array is sorted by the suppliers names / minimum order quantity
      */