Switch back to 6.44 for cloudbuild as nrf NCS revision is not matching

[andy31415]

Fixes cloudbuild errors after #25443

...
Traceback (most recent call last):
2023-03-03 21:14:32 ERROR   Failed to validate ZEPHYR_BASE status
2023-03-03 21:14:32 INFO    ################################################################################
2023-03-03 21:14:32 INFO    # /workspace/scripts/setup/nrfconnect/update_ncs.py --update                   #
2023-03-03 21:14:32 INFO    # Consider updating NCS to the recommended revision, by calling:               #
2023-03-03 21:14:32 INFO    # Please be aware that it may lead to encountering unexpected problems.        #
...

[github-actions]

PR #25469: Size comparison from 50af118 to de1f292

Decreases (1 build for cc32xx)

platform	target	config	section	50af118	de1f292	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	20262928	20262927	-1	-0.0

Full report (1 build for cc32xx)

platform	target	config	section	50af118	de1f292	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	643465	643465	0	0.0
			(read/write)	203688	203688	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197088	197088	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	930213	930213	0	0.0
			.debug_aranges	87336	87336	0	0.0
			.debug_frame	300024	300024	0	0.0
			.debug_info	20262928	20262927	-1	-0.0
			.debug_line	2657820	2657820	0	0.0
			.debug_loc	2800026	2800026	0	0.0
			.debug_ranges	282240	282240	0	0.0
			.debug_str	3023883	3023883	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	105929	105929	0	0.0
			.shstrtab	232	232	0	0.0
			.stab	204	204	0	0.0
			.stabstr	441	441	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	378514	378514	0	0.0
			.symtab	256560	256560	0	0.0
			.text	535412	535412	0	0.0