Corrected a few type-hints

[addiks]

There are a few incorrect (return- and argument-) types defined in doc-blocks that differ from the actual PHP native types and thus cause problems for static analysis (psalm in my case). This PR should fix these issues.
There might be more such wrong types, I have only now corrected the few types that were offending in my case.

ERROR: InvalidMethodCall - php/Foo/Bar/Baz.php:123:456 - Cannot call method on float variable  (see https://psalm.dev/091)
            $this->chargeAmount->getAmount()->toReal()->toNative(),

ERROR: InvalidArgument - php/Foo/Bar/Baz.php:123:456 - Argument 1 of ValueObjects\Money\Money::__construct expects int, ValueObjects\Number\Integer provided (see https://psalm.dev/004)
            $lowestMoney = new Money(new Integer((int)$lowestPrice), new Currency($this->catalog->getCurrencyCode()));

[coveralls]

Coverage remained the same at 100.0% when pulling 1414135 on addiks:master into 4b35857 on ytake:master.