fix: correct sentry__process_spawn signature in none implementation (#1436)

* fix: correct sentry__process_spawn signature in none implementation

PR #1413 changed the arg0 parameter from sentry_pathchar_t* to char*
as part of making narrow UTF-8 the canonical path encoding, but the
signature in sentry_process_none.c was not updated.

This fixes the function signature to match the declaration, changing
arg0 from `const sentry_pathchar_t *` to `const char *`.

Fixes regression from #1413

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

* Update CHANGELOG with unreleased fixes

Added unreleased section with fixes for PS5/Switch compilation regression.

---------

Co-authored-by: Claude <[email protected]>

Author: vaind

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+**Fixes**:
+
+- PS5/Switch compilation regression (`sentry__process_spawn` signature change) ([#1436](https://github.com/getsentry/sentry-native/pull/1436))
+
 ## 0.12.0
 
 **Breaking changes**:

src/process/sentry_process_none.c

@@ -3,7 +3,7 @@
 #include "sentry_core.h"
 
 void
-sentry__process_spawn(const sentry_path_t *UNUSED(executable),
-    const sentry_pathchar_t *UNUSED(arg0), ...)
+sentry__process_spawn(
+    const sentry_path_t *UNUSED(executable), const char *UNUSED(arg0), ...)
 {
 }