RUST-2058 Fix BSON WASM tests (#512)

Author: abr-egn

.evergreen/compile-only.sh

@@ -6,6 +6,10 @@ set -o errexit
 rustup update $RUST_VERSION
 
 if [ ! -z "$TARGET" ]; then
+    if [[ "$TARGET" = "wasm32-wasi" && "$RUST_VERSION" = "nightly" ]]; then
+        # renamed in newer versions of rustc
+        TARGET="wasm32-wasip1"
+    fi
     rustup target add $TARGET --toolchain $RUST_VERSION
     TARGET="--target=$TARGET"
 fi

.evergreen/run-wasm-tests.sh

@@ -4,6 +4,9 @@ set -o errexit
 
 . ~/.cargo/env
 
+rustup update 1.81
+rustup default 1.81
+
 curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
 
 cd $(dirname $0)/../wasm-test