[3.13] GH-120372: Switch to wasmtime 22 (GH-121523) (GH-121557)

GH-120372: Switch to wasmtime 22 (GH-121523)

Along the way, make the cache key in GitHub Actions for `config.cache` be more robust in the face of potential env var changes from `Tools/wasm/wasi.py`.
(cherry picked from commit 80209468144fbd1af5cd31f152a6631627a9acab)

Co-authored-by: Brett Cannon <brett@python.org>