Bump third_party/mbedtls/repo from e323fb3 to a31c6eb

[dependabot]

Bumps third_party/mbedtls/repo from e323fb3 to a31c6eb.

Commits

• a31c6eb Merge pull request #7488 from mprse/psa_init_in_programs_backport
• 96074b1 Merge pull request #7510 from daverodgman/fix-psa-aead-chacha20-test-dependen...
• 771552d Fix PSA AEAD ChaCha20 test dependency.
• 503f487 Merge pull request #7469 from xkqian/2.28/bignumber_update_comments
• 44f2694 Fix code-style
• d4d049b Add guards for mbedtls_psa_crypto_free()
• 8fa17b6 Init PSA in fuzz programs
• 9dd2167 Add changelog entry (PSA initialization in sample programs)
• 9c0fc2d Init PSA in pkey programs
• c4ddf92 Free psa crypto at the end of programs when initialized
• Additional commits viewable in compare view

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[github-actions]

PR #26310: Size comparison from 309e9f1 to c0db296

Full report (1 build for mbed)

platform	target	config	section	309e9f1	c0db296	change	% change
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2494888	2494888	0	0.0
			.bss	216296	216296	0	0.0
			.data	5144	5144	0	0.0
			.text	1457572	1457572	0	0.0

[andy31415]

@dependabot recreate

[github-actions]

PR #26310: Size comparison from 309e9f1 to b9acbe6

Decreases (1 build for cc32xx)

platform	target	config	section	309e9f1	b9acbe6	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	19535976	19535975	-1	-0.0

Full report (1 build for cc32xx)

platform	target	config	section	309e9f1	b9acbe6	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	602970	602970	0	0.0
			(read/write)	204156	204156	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197568	197568	0	0.0
			.comment	206	206	0	0.0
			.data	1468	1468	0	0.0
			.debug_abbrev	956979	956979	0	0.0
			.debug_aranges	103664	103664	0	0.0
			.debug_frame	350856	350856	0	0.0
			.debug_info	19535976	19535975	-1	-0.0
			.debug_line	2685310	2685310	0	0.0
			.debug_line_str	513	513	0	0.0
			.debug_loc	33340	33340	0	0.0
			.debug_loclists	1510189	1510189	0	0.0
			.debug_ranges	4984	4984	0	0.0
			.debug_rnglists	96278	96278	0	0.0
			.debug_str	3059525	3059525	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104250	104250	0	0.0
			.shstrtab	265	265	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	481887	481887	0	0.0
			.symtab	287248	287248	0	0.0
			.text	496596	496596	0	0.0