fix(pricing, types): update calculatePrices return type to match actual type (#5709)

* initial type fix

* add changeset

* update changeset

* update tsdocs

---------

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>
Co-authored-by: Riqwan Thamir <rmthamir@gmail.com>

.changeset/weak-bees-wash.md

@@ -0,0 +1,6 @@
+---
+"@medusajs/pricing": patch
+"@medusajs/types": patch
+---
+
+fix(pricing, types): update pricingModule.calculateprices return type to match actual type