fix(rc): switch from type to typecode for mp reliability

This switches the shared data for the remote configuration PublisherSubscriberConnector to use a typecode instead
of a type that relies on sizeof. This should be more reliable across Python versions and fix an issue with Python3.13:

```
get_mp_context().Array(c_char, SHARED_MEMORY_SIZE, lock=False): TypeError: this type has no size
```

This change should be identical, and for more information, see the docs here:

- https://docs.python.org/3/library/multiprocessing.html#multiprocessing.Array
- https://docs.python.org/3/library/array.html#module-array
- https://docs.python.org/3/library/ctypes.html

Refs: DEBUG-4453

Author: tylfin

ddtrace/internal/remoteconfig/_connectors.py

@@ -1,4 +1,3 @@
-from ctypes import c_char
 from dataclasses import asdict
 import json
 import os
@@ -46,7 +45,7 @@ class PublisherSubscriberConnector:
 
     def __init__(self):
         try:
-            self.data = get_mp_context().Array(c_char, SHARED_MEMORY_SIZE, lock=False)
+            self.data = get_mp_context().Array("c", SHARED_MEMORY_SIZE, lock=False)
         except FileNotFoundError:
             log.warning(
                 "Unable to create shared memory. Features relying on remote configuration will not work as expected."

releasenotes/notes/rc_switch_to_typecode-9409c92e8a07a8be.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    RemoteConfig: Fixes an issue introduced in Python 3.13 where creating a shared
+    array with the c_char type raised a TypeError, this now uses the 'c' typecode
+    for better compatibility across versions.