Merge 'Pre-release amendments' from Piotr Sarna (#78)

1. make the tool/pre-release.sh script fail with the wrong number of parameters
2. explicitly set rust-toolchain to 1.65.0

Author: penberg

src/rust/wasmtime-bindings/rust-toolchain

@@ -0,0 +1 @@
+1.65.0

tool/pre-release.sh

@@ -7,6 +7,7 @@
 
 if [[ "$#" != "1" ]]; then
     echo "Usage: $0 <release-number>"
+    exit 1
 fi
 
 for mode in "" "--enable-wasm-runtime" "--enable-wasm-runtime-dynamic"; do