Bump third_party/mbedtls/repo from `c469850` to `4637ed2` (#23591)

Bumps [third_party/mbedtls/repo](https://github.com/ARMmbed/mbedtls) from `c469850` to `4637ed2`.
- [Release notes](https://github.com/ARMmbed/mbedtls/releases)
- [Commits](https://github.com/ARMmbed/mbedtls/compare/c4698502d6765b44f66754b2ca04b04fc43ce602...4637ed2205d91710cf9357f7ba8b4fb92d1a8823)

---
updated-dependencies:
- dependency-name: third_party/mbedtls/repo
  dependency-type: direct:production
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/third_party/mbedtls/repo b/third_party/mbedtls/repo
index c469850..4637ed2 160000
--- a/third_party/mbedtls/repo
+++ b/third_party/mbedtls/repo
@@ -1 +1 @@
-Subproject commit c4698502d6765b44f66754b2ca04b04fc43ce602
+Subproject commit 4637ed2205d91710cf9357f7ba8b4fb92d1a8823