Use latest nightly for MIPS builds.

As MIPS is a tier-3 target, we must use the nightly toolchain for
building the MIPS binaries. This updates the nightly toolchain to the
latest versionl.

Author: brocaar

Makefile

@@ -20,8 +20,8 @@ build-x86_64-unknown-linux-musl:
 
 build-mipsel-unknown-linux-musl:
 	# mipsel is a tier-3 target.
-	rustup toolchain add nightly-2025-02-14-x86_64-unknown-linux-gnu
-	cross +nightly-2025-02-14 build -Z build-std=std --target mipsel-unknown-linux-musl --release
+	rustup toolchain add nightly-2025-10-22-x86_64-unknown-linux-gnu
+	cross +nightly-2025-10-22 build -Z build-std=std --target mipsel-unknown-linux-musl --release
 
 # Build distributable binaries for all targets.
 dist: dist-aarch64-unknown-linux-musl \