Update file extension used by create_release script (#1285)

This should have been part of #1235

emsdk.py

diff --git a/emsdk.py b/emsdk.py
index f1079dd..e0e46b9 100644
--- a/emsdk.py
+++ b/emsdk.py
@@ -2101,7 +2101,7 @@
     )
 
   for release in recent_releases:
-    make_url('tbz2' if not WINDOWS else 'zip')
+    make_url('tar.xz' if not WINDOWS else 'zip')
     try:
       urlopen(make_url('tar.xz' if not WINDOWS else 'zip'))
     except:

scripts/update_bazel_workspace.py

diff --git a/scripts/update_bazel_workspace.py b/scripts/update_bazel_workspace.py
index 932cc72..874b49b 100755
--- a/scripts/update_bazel_workspace.py
+++ b/scripts/update_bazel_workspace.py
@@ -39,9 +39,9 @@
     return f'''\
     "{version}": struct(
         hash = "{latest_hash}",
-        sha_linux = "{get_sha('linux', 'tbz2', latest_hash)}",
-        sha_mac = "{get_sha('mac', 'tbz2', latest_hash)}",
-        sha_mac_arm64 = "{get_sha('mac', 'tbz2', latest_hash, '-arm64')}",
+        sha_linux = "{get_sha('linux', 'tar.xz', latest_hash)}",
+        sha_mac = "{get_sha('mac', 'tar.xz', latest_hash)}",
+        sha_mac_arm64 = "{get_sha('mac', 'tar.xz', latest_hash, '-arm64')}",
         sha_win = "{get_sha('win', 'zip', latest_hash)}",
     ),
 '''