Bump third_party/openthread/repo from e63c5d3 to 6bfcc0d

[dependabot]

Bumps third_party/openthread/repo from e63c5d3 to 6bfcc0d.

Commits

• 6bfcc0d [test] require either mdns or avahi (#8959)
• 2a93eea [sub-mac] check key-id to match in SignalFrameCounterUsed() (#8978)
• 658179f [dns-client] fix finalizing query from HandleTimer() (#8982)
• 6955fde [github-actions] replace deprecated set-output commands (#8976)
• 4a41cb4 [mle] enable Inform Previous Parent feature by default (#8969)
• f0232d0 github-actions: bump github/codeql-action from 2.2.5 to 2.2.12 (#8968)
• 9783c14 [nat64] add function for parsing IPv4 CIDR (#8954)
• 25fe46d [mle] simplify parsing of Address Registration TLV entries (#8963)
• See full diff in compare view

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[github-actions]

PR #26211: Size comparison from de0dfcf to af3d4db

Decreases (1 build for cc32xx)

platform	target	config	section	de0dfcf	af3d4db	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	20330829	20330828	-1	-0.0

Full report (1 build for cc32xx)

platform	target	config	section	de0dfcf	af3d4db	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	643249	643249	0	0.0
			(read/write)	203848	203848	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197248	197248	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	933224	933224	0	0.0
			.debug_aranges	87792	87792	0	0.0
			.debug_frame	302140	302140	0	0.0
			.debug_info	20330829	20330828	-1	-0.0
			.debug_line	2687904	2687904	0	0.0
			.debug_loc	2838960	2838960	0	0.0
			.debug_ranges	288072	288072	0	0.0
			.debug_str	3042335	3042335	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104401	104401	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	377963	377963	0	0.0
			.symtab	256976	256976	0	0.0
			.text	536728	536728	0	0.0