fix(deps): pin lora-phy to swaits/lora-rs#fixed for sx127x/sx126x reliability

Switch lora-phy from crates.io to the swaits/lora-rs "fixed" branch
which carries three fixes awaiting upstream PR acceptance:

  - phy: sx127x: clear stale IRQ flags before reconfiguring DIO mapping
    in set_irq_params (fix/sx127x-irq-clear-position)
  - phy: sx127x: clear stale IRQ flags in do_rx before mode change
    (fix/sx127x-rx-irq-clear)
  - phy: sx126x: pre-command BUSY check + standby/IRQ-clear hygiene
    around CAD (fix/sx126x-busy-race)

Validates TBeam classic (sx127x) in particular and tightens reliability
across every board (the sx126x BUSY-race fix lands on every nRF/RP2040
board too). Pinned to commit e8a52ebd via Cargo.lock; revert to
crates.io once the three PRs land upstream.

Cargo.toml

@@ -34,9 +34,9 @@ ucobs = { version = "0.3", features = ["legacy-msrv"] }
 heapless = "0.9"
 donglora-protocol = "1"
 hsmc = { version = "0.5", default-features = false, features = ["embassy", "trace-defmt"] }
-# Local path while iterating on CAD IRQ-clear / standby-after-CAD fixes.
-# Switch back to git fork (then crates.io) once changes are upstreamed.
-lora-phy = { path = "../../lora-rs/lora-phy", features = ["defmt-03"] }
+# Fork branch carrying CAD IRQ-clear / standby-after-CAD fixes awaiting upstream PRs.
+# Switch back to crates.io once changes are upstreamed.
+lora-phy = { git = "https://github.com/swaits/lora-rs.git", branch = "fixed", features = ["defmt-03"] }
 portable-atomic = { version = "1", default-features = false, features = ["critical-section"] }
 static_cell = "2.1"