Use the canonical timezone for Mountain Time #48

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Job	Run time
multi-arch-test (armv6, bookworm)	4m 54s
multi-arch-test (armv7, bookworm)	4m 40s
multi-arch-test (aarch64, bookworm)	3m 41s
multi-arch-test (s390x, bookworm)	4m 54s
multi-arch-test (ppc64le, bookworm)	4m 32s
multi-arch-test (armv7, ubuntu_latest)	5m 36s
multi-arch-test (aarch64, ubuntu_latest)	41m 10s
multi-arch-test (riscv64, ubuntu_devel)	4m 50s
multi-arch-test (s390x, ubuntu_latest)	4m 55s
multi-arch-test (ppc64le, ubuntu_latest)	4m 56s
multi-arch-test (armv7, ubuntu22.04)	5m 57s
multi-arch-test (aarch64, ubuntu22.04)	3m 52s
multi-arch-test (s390x, ubuntu22.04)	5m 31s
multi-arch-test (ppc64le, ubuntu22.04)	5m 8s
multi-arch-test (armv6, alpine_latest)	7m 14s
multi-arch-test (armv7, alpine_latest)	6m 52s
multi-arch-test (aarch64, alpine_latest)	5m 8s
multi-arch-test (riscv64, alpine_latest)	6m 25s
multi-arch-test (s390x, alpine_latest)	6m 52s
multi-arch-test (ppc64le, alpine_latest)	6m 35s
	2h 23m 42s

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