Bump Syzygy binaries to 0.8.20.7.

BUG=644608
TBR=sebmarchand@chromium.org

Review-Url: https://codereview.chromium.org/2324463005
Cr-Commit-Position: refs/heads/master@{#417587}

DEPS

@@ -941,7 +941,7 @@ hooks = [
     'action': ['python',
                'src/build/get_syzygy_binaries.py',
                '--output-dir=src/third_party/syzygy/binaries',
-               '--revision=5f06b860d3d0cf3079736c14f4bc1be47089edd4',
+               '--revision=ba2ce2c31c16fe53b337121ec480fc5d4dfb4eec',
                '--overwrite',
     ],
   },