Update V8 DEPS (trusted-versions)

Rolling v8/buildtools/third_party/libc++/trunk: https://chromium.googlesource.com/external/github.com/llvm/llvm-project/libcxx/+log/1f6f8b7..6cc58d6

R=v8-waterfall-sheriff@grotations.appspotmail.com,mtv-sf-v8-sheriff@grotations.appspotmail.com

Change-Id: If21e4148c29a89513cc54be48fe77de8733587c0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3831634
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#82460}

DEPS

@@ -117,7 +117,7 @@ deps = {
     'condition': 'host_os == "mac"',
   },
   'buildtools/third_party/libc++/trunk':
-    Var('chromium_url') + '/external/github.com/llvm/llvm-project/libcxx.git' + '@' + '1f6f8b77bcd49143217867bba82aac7333bfe1e2',
+    Var('chromium_url') + '/external/github.com/llvm/llvm-project/libcxx.git' + '@' + '6cc58d640cfe272f079b07da2e03781796c6a6aa',
   'buildtools/third_party/libc++abi/trunk':
     Var('chromium_url') + '/external/github.com/llvm/llvm-project/libcxxabi.git' + '@' + '039323b945911a54cb7400da8fb14fcbb0348e97',
   'buildtools/third_party/libunwind/trunk':