Update wasm-smith to generate more wasm (#2967)

This brings in bytecodealliance/wasm-tools#277 which should improve the
wasm programs that wasm-smith generates.

Cargo.lock

@@ -3433,9 +3433,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-smith"
-version = "0.4.4"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a982408719f704307ac7f45247350f06ce739d759362ef8293ed7b4d922adee8"
+checksum = "f7e95fdeed16adeffed44efdc7ccf27d4f57ff2e99de417c75bcee7dee09049b"
 dependencies = [
  "arbitrary",
  "indexmap",

crates/fuzzing/Cargo.toml

@@ -18,7 +18,7 @@ wasmprinter = "0.2.26"
 wasmtime = { path = "../wasmtime" }
 wasmtime-wast = { path = "../wast" }
 wasm-encoder = "0.4.1"
-wasm-smith = "0.4.4"
+wasm-smith = "0.4.5"
 wasmi = "0.7.0"
 
 [dev-dependencies]