Update framework-portduino version in platform.json

[thebentern]

Summary

Bumps the framework-portduino git ref from 45b678b to 4473291 (the merge of meshtastic/framework-portduino#68) so this platform picks up the WiFi submodule's extern "C" / logging.h fix in WiFiServer.cpp.

What's in the bump

4473291 — "Bump libraries/WiFi to pick up extern "C" / logging.h fix" (framework-portduino#68). Single submodule pointer change: c75a5e8 → 467ec17 in libraries/WiFi. That submodule commit (meshtastic/WiFi#5) moves #include "logging.h" out of WiFiServer.cpp's extern "C" { ... } block so arduino::log(...) keeps C++ linkage and doesn't collide with libc's extern "C" double log(double) from <math.h> under Apple Clang.

Context

Hit while bringing up the macOS-native portduino build — see firmware PR meshtastic/firmware#10300.

Downstream chain

• ✅ meshtastic/WiFi#5 — fix the file in the submodule (merged).
• ✅ meshtastic/framework-portduino#68 — bump the submodule pointer (merged).
• (this PR) — bump the framework-portduino git ref.
• Update platform-native digest to 135b91e firmware#10300 — drop `bin/patch-framework-portduino-darwin.py` and its `extra_scripts` entry, then bump `portduino_base.platform` to this PR's merge SHA.

Test plan

• No-op on Linux: pure pin bump; the framework-side change is preprocessor-order only.
• Verified equivalent transformation builds meshtasticd cleanly on macOS arm64 — the firmware-side pre-build patcher applies the same reordering and the resulting binary boots in SimRadio mode.

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