timeutils: accept single digit timezone hours in strptime() #1497

Job	Run time
create-source-tarball	1m 53s
create-packages / almalinux-8	5m 9s
create-packages / debian-bookworm	6m 48s
create-packages / debian-testing	6m 30s
create-packages / fedora-39	6m 38s
create-packages / ubuntu-noble	8m 57s
	35m 55s

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