Bump bl from 1.2.2 to 4.0.3

Bumps [bl](https://github.com/rvagg/bl) from 1.2.2 to 4.0.3.
- [Release notes](https://github.com/rvagg/bl/releases)
- [Commits](rvagg/bl@v1.2.2...v4.0.3)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -13,7 +13,7 @@
   },
   "license": "MIT",
   "dependencies": {
-    "bl": "^1.2.0",
+    "bl": "^4.0.3",
     "pumpify": "^1.3.0",
     "split": "^1.0.0",
     "through2": "~2.0.3"