fixup! build: bump RUSTC_VERSION to 1.88 in github workflows

Author: joyeecheung

BUILDING.md

@@ -1059,7 +1059,7 @@ Node.js supports the [Temporal](https://github.com/tc39/proposal-temporal) APIs,
 linking statically or dynamically with a version of [temporal\_rs](https://github.com/boa-dev/temporal).
 Building it requires a Rust toolchain:
 
-* rustc >= 1.86 (with LLVM >= 19)
+* rustc >= 1.88 (with LLVM >= 19)
 * cargo >= 1.86
 
 Refer to [Install Rust](https://rust-lang.org/tools/install/) for instructions.