fix: 🐛 Apply useWritePdo() to all createOrFirst impls

Author: mpyw

src/Illuminate/Database/Eloquent/Builder.php

@@ -582,7 +582,7 @@ public function createOrFirst(array $attributes = [], array $values = [])
         try {
             return $this->withSavepointIfNeeded(fn () => $this->create(array_merge($attributes, $values)));
         } catch (UniqueConstraintViolationException $exception) {
-            return $this->where($attributes)->first();
+            return $this->useWritePdo()->where($attributes)->first();
         }
     }
 

src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php

@@ -653,7 +653,7 @@ public function createOrFirst(array $attributes = [], array $values = [], array
                 $this->getQuery()->withSavepointIfNeeded(fn () => $this->attach($instance, $joining, $touch));
             });
         } catch (UniqueConstraintViolationException $exception) {
-            return (clone $this)->where($attributes)->first();
+            return (clone $this)->useWritePdo()->where($attributes)->first();
         }
     }