chore: drop toolchain line in go.mod

Signed-off-by: Christian Stewart <christian@aperture.us>

Author: paralin

go.mod

@@ -2,8 +2,6 @@ module github.com/aperturerobotics/controllerbus
 
 go 1.24.0
 
-toolchain go1.25.1
-
 // This fork drops ecdsa, drops secp256k1, adds eddilithium2 and eddilithium3
 replace github.com/libp2p/go-libp2p => github.com/aperturerobotics/go-libp2p v0.37.1-0.20241111002741-5cfbb50b74e0 // aperture