tools/create-image.sh: update default Debian release to trixie #141

Job	Run time
gvisor	4m 6s
aux	4m 45s
build	1d 0h 0m 1s
race_dashboard	1d 0h 0m 1s
race	1s
old	7m 13s
arch (presubmit_arch_netbsd)	3m 42s
arch (presubmit_arch_openbsd)	3m 43s
arch (presubmit_arch_freebsd)	6m 17s
arch (presubmit_arch_windows)	3m 32s
arch (presubmit_arch_linux)	10m 32s
dashboard	1s
arch (presubmit_arch_executor)	2m 59s
arch (presubmit_arch_darwin)	3m 32s
	2d 0h 50m 25s

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