nixpkgs: bumped to the HEAD of 21.05

nix/sources.json

@@ -54,10 +54,10 @@
         "homepage": "https://github.com/NixOS/nixpkgs",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "eaba7870ffc3400eca4407baa24184b7fe337ec1",
-        "sha256": "115disiz4b08iw46cidc7lm0advrxn5g2ldmlrxd53zf03skyb2w",
+        "rev": "5de44c15758465f8ddf84d541ba300b48e56eda4",
+        "sha256": "05darjv3zc5lfqx9ck7by6p90xgbgs1ni6193pw5zvi7xp2qlg4x",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/eaba7870ffc3400eca4407baa24184b7fe337ec1.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/5de44c15758465f8ddf84d541ba300b48e56eda4.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }