Fix auto-version-update script

Removes two imports from development/auto-version-updater/update_versions_for_release.py that were not actually being used.

Also updated JetpadClient to reference a correct `date` variable instead of the `args.date` variable that doesn't exist.

Test: ./update_versions_for_release.py 1658941200000
Test: ./test_update_versions_for_release.py
Change-Id: I275bc4bc4b28f17bd8ce6579fd18ec0b0093167c

diff --git a/development/JetpadClient.py b/development/JetpadClient.py
index 1e15f07..19b74bc 100644
--- a/development/JetpadClient.py
+++ b/development/JetpadClient.py

@@ -33,7 +33,7 @@
         return None
     rawJetpadReleaseOutputLines = rawJetpadReleaseOutput.splitlines()
     if len(rawJetpadReleaseOutputLines) <= 2:
-        print_e("Error: Date %s returned zero results from Jetpad.  Please check your date" % args.date)
+        print_e("Error: Date %s returned zero results from Jetpad.  Please check your date" % date)
         return None
     jetpadReleaseOutput = iter(rawJetpadReleaseOutputLines)
     return jetpadReleaseOutput