fix(git): remove Git LFS config for GIF files

GIF files were never migrated to LFS storage - they are regular
git-tracked binary files. The lfs filter in .gitattributes was
causing GitHub Actions to detect dirty state when checking out
with lfs: true. Remove LFS config and checkout flag to fix.

Author: anIcedAntFA

.gitattributes

@@ -1,3 +1,3 @@
-# Git LFS tracking for large demo files
-docs/demos/*.gif filter=lfs diff=lfs merge=lfs -text
+# Git attributes for demo files
+# Note: GIF files are stored as regular git files, not using LFS
 docs/demos/*.cast -diff

.github/workflows/release.yml

@@ -20,7 +20,6 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          lfs: true
 
       - name: Setup Go
         uses: actions/setup-go@v5