Bump third_party/mbedtls/repo from `0834c59` to `2153b1b` #102675

Job	Run time
Build framework (macos-release, -sdk macosx -configuration Release)	15m 53s
Build framework (macos-release, -sdk macosx -configuration Release)	15m 53s
Build framework (ios-release, -sdk iphoneos -configuration Release)	10m 4s
Build framework (ios-release, -sdk iphoneos -configuration Release)	10m 4s
Build framework (tvos-debug, -sdk appletvos -configuration Debug)	11m 13s
Build framework (tvos-debug, -sdk appletvos -configuration Debug)	11m 13s
Build framework (watchos-debug, -sdk watchos -configuration Debug)	13m 33s
Build framework (watchos-debug, -sdk watchos -configuration Debug)	13m 33s
Run framework tests (asan, -enableAddressSanitizer YES -enableUndefinedBehaviorSanitizer YES)	25m 4s
Run framework tests (asan, -enableAddressSanitizer YES -enableUndefinedBehaviorSanitizer YES)	37m 16s
Run framework tests (tsan, -enableThreadSanitizer YES)	38m 0s
Run framework tests (tsan, -enableThreadSanitizer YES)	42m 39s
Run framework tests (leaks, ENABLE_LEAK_DETECTION=1)	37m 11s
Run framework tests (leaks, ENABLE_LEAK_DETECTION=1)	33m 14s
	5h 14m 50s

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