Update `wasmtime@latest` to 21.0.1 #4353

Job	Run time
test (ubuntu-20.04)	1m 5s
test-container (ubuntu:18.04)	3m 32s
test (ubuntu-22.04)	1m 16s
manifest	1m 48s
test-no-cargo	45s
test-container (ubuntu:20.04)	5m 17s
test (ubuntu-22.04, major.minor.patch)	40s
test-container (ubuntu:22.04)	1m 45s
test (ubuntu-22.04, major.minor)	40s
test-container (ubuntu:24.04)	1m 17s
test (ubuntu-22.04, major)	22s
test (macos-12)	43s
test-container (debian:10-slim)	54s
test (macos-13)	45s
test-container (debian:11-slim)	1m 11s
test (macos-14)	54s
test-container (debian:12-slim)	59s
test (windows-2019)	1m 37s
test-container (fedora:latest)	53s
test (windows-2022)	1m 30s
test-container (almalinux:8)	48s
test-container (almalinux:8-minimal)	1m 6s
test-container (almalinux:9)	48s
tidy / tidy	1m 34s
test-container (almalinux:9-minimal)	49s
test-container (centos:7)	1m 22s
test-container (opensuse/leap:latest)	2m 5s
test-container (opensuse/tumbleweed:latest)	53s
test-container (archlinux:latest)	56s
test-container (alpine:latest)	45s
	38m 59s

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