Update release notes for 20.27.3 (#7067)

Author: jameswoo-stripe

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## XX.XX.XX - 2023-XX-XX
 
+## 20.27.3 - 2023-07-24
+
 ### Payments
 * [CHANGED] The return type for several methods in `Stripe` has changed from `T?` (nullable) to `T` to better reflect possible behavior. These methods continue to be throwing and should be wrapped in a `try/catch` block.
 * [FIXED][6977](https://github.com/stripe/stripe-android/pull/6977) Fixed an issue where `Stripe.retrievePossibleBrands()` returned incorrect results.