chore: 删去 pre-commit-ci 中 oxipng 的 --alpha 参数

README 里写着说这个玩意不是严格意义的无损压缩

.pre-commit-config.yaml

@@ -7,7 +7,7 @@ repos:
     rev: v9.1.2
     hooks:
       - id: oxipng
-        args: ["-q", "-o", "2", "-s", "--ng", "--alpha"]
+        args: ["-q", "-o", "2", "-s", "--ng"]
   - repo: https://github.com/pre-commit/mirrors-prettier
     rev: v4.0.0-alpha.8
     hooks: