remove accidental gifsicle dependency

Author: transitive-bullshit

package.json

@@ -25,7 +25,6 @@
     "consolidate": "^0.15.0",
     "cp-file": "^5.0.0",
     "execa": "^0.9.0",
-    "gifsicle": "^3.0.4",
     "git-config-path": "^1.0.1",
     "github-username": "^4.1.0",
     "globby": "^8.0.1",