Update Rust toolchains.

The autoroller script must be updated to do this automatically but to
unblock other changes, this time we do it manually.

Bug: webrtc:403297821
Change-Id: Ia8519205c74cca65d8b09e36067759a5f50b103f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/381101
Commit-Queue: Jeremy Leconte <jleconte@webrtc.org>
Reviewed-by: Jeremy Leconte <jleconte@webrtc.org>
Auto-Submit: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#44136}
diff --git a/DEPS b/DEPS
index f571093..894596c 100644
--- a/DEPS
+++ b/DEPS
@@ -127,36 +127,37 @@
     'condition': 'not (host_os == "linux" and host_cpu == "arm64")',
   },
 
+  # Update prebuilt Rust toolchain.
   'src/third_party/rust-toolchain': {
     'dep_type': 'gcs',
     'bucket': 'chromium-browser-clang',
     'objects': [
       {
-        'object_name': 'Linux_x64/rust-toolchain-009e73825af0e59ad4fc603562e038b3dbd6593a-2-llvmorg-20-init-3847-g69c43468.tar.xz',
-        'sha256sum': '043bc520520424fad9fdfc87102e3af7c8f1ca4da3f7885e18f54fd29fc783e4',
-        'size_bytes': 115068636,
-        'generation': 1725552307196828,
+        'object_name': 'Linux_x64/rust-toolchain-9fcc9cf4a202aadfe1f44722b39c83536eba3dba-2-llvmorg-21-init-1655-g7b473dfe.tar.xz',
+        'sha256sum': '4bf96a6d0d9bdff23475e556d925bb6846036859ea3868c2c74caa8e5fab42df',
+        'size_bytes': 116749200,
+        'generation': 1739484481010800,
         'condition': 'host_os == "linux" and non_git_source',
       },
       {
-        'object_name': 'Mac/rust-toolchain-009e73825af0e59ad4fc603562e038b3dbd6593a-2-llvmorg-20-init-3847-g69c43468.tar.xz',
-        'sha256sum': '100befb02da0940fdede41a0ad0e28ded1ce4b6794b5e488bccc91ba1d27348a',
-        'size_bytes': 108415524,
-        'generation': 1725552308530261,
+        'object_name': 'Mac/rust-toolchain-9fcc9cf4a202aadfe1f44722b39c83536eba3dba-2-llvmorg-21-init-1655-g7b473dfe.tar.xz',
+        'sha256sum': '6d950bab0d0cdf7ae201344b55291def8a6b2bd868fb477133ce5532ab6c1e55',
+        'size_bytes': 109928956,
+        'generation': 1739484482836636,
         'condition': 'host_os == "mac" and host_cpu == "x64"',
       },
       {
-        'object_name': 'Mac_arm64/rust-toolchain-009e73825af0e59ad4fc603562e038b3dbd6593a-2-llvmorg-20-init-3847-g69c43468.tar.xz',
-        'sha256sum': '6f3ba8fe5a9590b476c087b412bd60e7e46ec59bc37aac76d9f7894c6bc34a75',
-        'size_bytes': 97820200,
-        'generation': 1725552309875662,
+        'object_name': 'Mac_arm64/rust-toolchain-9fcc9cf4a202aadfe1f44722b39c83536eba3dba-2-llvmorg-21-init-1655-g7b473dfe.tar.xz',
+        'sha256sum': 'fd1620c4cced85861f5838e177fc8e1cbe1973a365143ed7de32a19c9e9cb725',
+        'size_bytes': 98784068,
+        'generation': 1739484484763552,
         'condition': 'host_os == "mac" and host_cpu == "arm64"',
       },
       {
-        'object_name': 'Win/rust-toolchain-009e73825af0e59ad4fc603562e038b3dbd6593a-2-llvmorg-20-init-3847-g69c43468.tar.xz',
-        'sha256sum': '1d04274c7a96aa0148a9bb5b29fa5b33c24b97971e33634bed62ce504b1cb346',
-        'size_bytes': 172453420,
-        'generation': 1725552311180142,
+        'object_name': 'Win/rust-toolchain-9fcc9cf4a202aadfe1f44722b39c83536eba3dba-2-llvmorg-21-init-1655-g7b473dfe.tar.xz',
+        'sha256sum': 'e06ac15f6cdab4cd2ac259785adf93da5275e44060c794ba8ff5bd5b4c29ff28',
+        'size_bytes': 178946936,
+        'generation': 1739484486536378,
         'condition': 'host_os == "win"',
       },
     ],