ci: Prefer --filter=blob:none over --depth=N

Flutter upstream changed it's version number calculation and
it now doesn't play well with "shallow clone".

CZO discussion:
  https://chat.zulip.org/#narrow/channel/243-mobile-team/topic/CI.20failing.20after.20Flutter.20upgrade/with/2258300

Author: rajveermalviya

.github/workflows/ci.yml

@@ -18,16 +18,10 @@ jobs:
         distribution: temurin
 
     - name: Clone Flutter SDK
-      # We can't do a depth-1 clone, because we need the most recent tag
-      # so that Flutter knows its version and sees the constraint in our
-      # pubspec is satisfied.  It's uncommon for flutter/flutter to go
-      # more than 100 commits between tags.  Fetch 1000 for good measure.
-      # TODO(upstream): Around 2025-05, Flutter upstream stopped making
-      #   tags within the main/master branch.  Get that fixed:
-      #     https://github.com/zulip/zulip-flutter/issues/1710
-      #   Pending that, fetch more than 1000 commits.
+      # Upstream's version calculation fails with a shallow clone,
+      # so instead clone with `--filter=blob:none`.
       run: |
-        git clone --depth=3000 -b main https://github.com/flutter/flutter ~/flutter
+        git clone --filter=blob:none -b main https://github.com/flutter/flutter ~/flutter
         TZ=UTC git --git-dir ~/flutter/.git log -1 --format='%h | %ci | %s' --date=iso8601-local
         echo ~/flutter/bin >> "$GITHUB_PATH"
 

.github/workflows/update-translations.yml

@@ -25,13 +25,10 @@ jobs:
           git reset --hard weblate/main
 
       - name: Clone Flutter SDK
-        # We can't do a depth-1 clone, because we need the most recent tag
-        # so that Flutter knows its version and sees the constraint in our
-        # pubspec is satisfied.  It's uncommon for flutter/flutter to go
-        # more than 100 commits between tags.  Fetch 1000 for good measure.
-        # TODO(upstream): See ci.yml for why we fetch more than 1000.
+        # Upstream's version calculation fails with a shallow clone,
+        # so instead clone with `--filter=blob:none`.
         run: |
-          git clone --depth=3000 -b main https://github.com/flutter/flutter ~/flutter
+          git clone --filter=blob:none -b main https://github.com/flutter/flutter ~/flutter
           TZ=UTC git --git-dir ~/flutter/.git log -1 --format='%h | %ci | %s' --date=iso8601-local
           echo ~/flutter/bin >> "$GITHUB_PATH"