Update Fuchsia ARM64 SDK version after reland.

Reland "Add third_party/qemu-linux-arm64 to DEPS runhooks."
https://chromium-review.googlesource.com/c/chromium/src/+/1913570
missed the Fuchsia ARM64 SDK version update from
https://chromium-review.googlesource.com/c/chromium/src/+/1880067
which used an SDK CIPD created with copy mode instead of symlink mode.

A copy mode CIPD is required to load the SDK into test isolates.

Bug: 1000901
Change-Id: Iebc603a14c9b557b55a99de1d5968231c4bb40f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912895
Auto-Submit: Stephen Roe <steveroe@google.com>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: Stephen Roe <steveroe@google.com>
Cr-Commit-Position: refs/heads/master@{#715076}

DEPS

@@ -941,7 +941,7 @@ deps = {
       'packages': [
           {
               'package': 'fuchsia/sdk/core/linux-arm64',
-              'version': 'J4QyYSv0T-30YSgD6d34XHRpck2ckNh-4MMhsRYj4zoC'
+              'version': 'xbqDSJKkLORclZW8h9et17dVsOjaxurf7RElMu0fGvUC'
           },
       ],
       'condition': 'host_os == "linux" and (checkout_fuchsia and checkout_fuchsia_for_arm64_host)',