py: fetch commit binaries from different bucket

The ubuntu1404 bucket will no longer be updated with new binaries.

bazelisk.py

diff --git a/bazelisk.py b/bazelisk.py
index 01a4c57..5de6eff 100755
--- a/bazelisk.py
+++ b/bazelisk.py
@@ -54,7 +54,7 @@
     "https://storage.googleapis.com/bazel-builds/artifacts/{platform}/{commit}/bazel"
 )
 
-SUPPORTED_PLATFORMS = {"linux": "ubuntu1404", "windows": "windows", "darwin": "macos"}
+SUPPORTED_PLATFORMS = {"linux": "linux", "windows": "windows", "darwin": "macos"}
 
 TOOLS_BAZEL_PATH = "./tools/bazel"