Pin wasm-pack version

As with anything else, downloading a random version from crates risks
breaking CI. This change decreases the risk by pinning the crate but so
far makes *no attempts* at trying to update it in a cron job. It would
be definitely a nice addition later.

Author: Kixunil

contrib/wasm.sh

@@ -8,7 +8,7 @@
 set -euox pipefail
 
 clang --version
-CARGO_TARGET_DIR=wasm cargo install --force wasm-pack
+CARGO_TARGET_DIR=wasm cargo install --locked --force wasm-pack --version "`cat wasm-pack-version`"
 printf '\n[lib]\ncrate-type = ["cdylib", "rlib"]\n' >> Cargo.toml
 CC=clang wasm-pack build
 CC=clang wasm-pack test --node

wasm-pack-version

@@ -0,0 +1 @@
+0.13.1