Add third_party/fuzztest/src to DEPS.

Bug: b/309389865
Change-Id: I290d09bed28591abb645739b1e916313abf9240e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/326180
Commit-Queue: Jeremy Leconte <jleconte@google.com>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Jeremy Leconte <jleconte@google.com>
Auto-Submit: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41084}
diff --git a/DEPS b/DEPS
index 0b5b972..3c38f89 100644
--- a/DEPS
+++ b/DEPS
@@ -276,6 +276,8 @@
   # Used for building libFuzzers (only supports Linux).
   'src/third_party/libFuzzer/src':
     'https://chromium.googlesource.com/external/github.com/llvm/llvm-project/compiler-rt/lib/fuzzer.git@758bd21f103a501b362b1ca46fa8fcb692eaa303',
+  'src/third_party/fuzztest/src':
+    'https://chromium.googlesource.com/external/github.com/google/fuzztest.git@b2220493586a1b96ff043cf27aaa6c24f0da8fb3',
   'src/third_party/libjpeg_turbo':
     'https://chromium.googlesource.com/chromium/deps/libjpeg_turbo.git@9b894306ec3b28cea46e84c32b56773a98c483da',
   'src/third_party/libsrtp':