feat: deprecate server_type_info included_traffic return value (#532

)

### API Changes for Traffic Prices and Server Type Included Traffic

There will be a breaking change in the API regarding Traffic Prices and
Server Type Included Traffic on 2024-08-05. This release marks the
affected fields as `Deprecated`. Please check if this affects any of
your code and switch to the replacement fields where necessary.

You can learn more about this change in [our
changelog](https://docs.hetzner.cloud/changelog#2024-07-25-cloud-api-returns-traffic-information-in-different-format).

changelogs/fragments/deprecate-server-type-pricing.yml

@@ -0,0 +1,3 @@
+minor_changes:
+  - server_type_info - The 'included_traffic' return value is deprecated and will be set to 'None' on 5 August 2024.
+    See https://docs.hetzner.cloud/changelog#2024-07-25-cloud-api-returns-traffic-information-in-different-format.

plugins/modules/server_type_info.py

@@ -96,7 +96,11 @@
             type: str
             sample: x86
         included_traffic:
-            description: Free traffic per month in bytes
+            description: |
+                Free traffic per month in bytes
+
+                B(Deprecated): This field is deprecated and will be set to C(None) on 5 August 2024.
+                See U(https://docs.hetzner.cloud/changelog#2024-07-25-cloud-api-returns-traffic-information-in-different-format).
             returned: always
             type: int
             sample: 21990232555520