Update Rust and Emscripten toolchains

Artichoke requires the latest Rust to build, which is based on LLVM 11.0. Emscripten targets "top of tree" LLVM, which can introduce incompatibilities with the code generated by Rust's embedded LLVM. Accoridng to rust-lang/rust#75716, LLVM 11.0-based Rusts work best with emdsk 1.39.20, which is the Emscripten most close to when LLVM 11.0 branched off of main.
artichoke · Nov 28, 2020 · 39d49fd · 39d49fd
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commit 39d49fd
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diff --git a/emscripten-toolchain b/emscripten-toolchain
@@ -1 +1 @@
-1.39.8-upstream
+1.39.20-upstream
diff --git a/rust-toolchain b/rust-toolchain
@@ -1 +1 @@
-1.41.0
+1.48.0