LAKITU: Update the repohooks with respect to `cos-patch` tag.

BUG=b/197329577
TEST=manually uploaded changes using `repo upload`
RELEASE_NOTE=NONE

Change-Id: I7cf152f09083c2e7dd016794c24a5d6a3c9f9390
Reviewed-on: https://cos-review.googlesource.com/c/cos/repohooks/+/21710
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Tested-by: Vaibhav Rustagi <vaibhavrustagi@google.com>

pre-upload.py

diff --git a/pre-upload.py b/pre-upload.py
index f493f48..229b718 100755
--- a/pre-upload.py
+++ b/pre-upload.py
@@ -121,7 +121,7 @@
 TEST_FIELD_RE = r'\nTEST=\S+'
 RELEASE_NOTE_FIELD_RE = r'\nRELEASE_NOTE=\S+'
 COS_PATCH_RE = (
-    r'\ncos-patch: (security-(critical|high|medium|low)|bug|lts-refresh)'
+    r'\ncos-patch: (security-(critical|high|moderate)|bug|lts-refresh)'
 )
 
 # Exceptions
@@ -796,7 +796,7 @@
            'cos-patch: security-critical\n'
            'cos-patch: bug\n'
            'cos-patch: lts-refresh\n'
-           'For valid values, please check go/cos-lts-policy.')
+           'For valid values, please check go/cos-lts-policy-dev-guide#commit-message-tagging.')
     return HookFailure(msg)
 
   # Check that 'cos-patch' is in the same paragraph as Change-Id.

pre-upload_unittest.py

diff --git a/pre-upload_unittest.py b/pre-upload_unittest.py
index 342eecf..f532cac 100755
--- a/pre-upload_unittest.py
+++ b/pre-upload_unittest.py
@@ -1637,9 +1637,7 @@
                                'Change-Id: I123')
     self.assertMessageAccepted('\ncos-patch: security-high\n'
                                'Change-Id: I123')
-    self.assertMessageAccepted('\ncos-patch: security-medium\n'
-                               'Change-Id: I123')
-    self.assertMessageAccepted('\ncos-patch: security-low\n'
+    self.assertMessageAccepted('\ncos-patch: security-moderate\n'
                                'Change-Id: I123')
     self.assertMessageAccepted('\ncos-patch: bug\n'
                                'Change-Id: I123')