Remove patch section for rp2040-boot2

No longer needed now that version 0.3.0 has been released

Author: jannic

Cargo.lock

@@ -69,6 +69,3 @@ lto = true
 # good choice for performance on the RP2040, where code executes from external
 # SPI Flash and has to be buffered in a small on-chip cache memory.
 opt-level = "s"
-
-[patch.crates-io]
-rp2040-boot2 = { version = "0.3.0", git = "https://github.com/rp-rs/rp2040-boot2" }