tools/create-image.sh: update default Debian release to trixie #18434

Job	Run time
race	7m 9s
race_dashboard	3m 47s
dashboard	2m 57s
aux	4m 33s
arch (presubmit_arch_netbsd)	3m 33s
gvisor	4m 3s
arch (presubmit_arch_openbsd)	3m 50s
build	5m 18s
arch (presubmit_arch_freebsd)	6m 36s
old	6m 38s
arch (presubmit_arch_linux)	10m 43s
arch (presubmit_arch_executor)	3m 24s
arch (presubmit_arch_windows)	3m 41s
arch (presubmit_arch_darwin)	3m 28s
	1h 9m 40s

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