update nixpkgs

btcpayserver: 1.2.0 -> 1.2.3
charge-lnd: 0.2.3 -> 0.2.4
nbxplorer: 2.1.58 -> 2.2.5

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "flake-utils": {
       "locked": {
-        "lastModified": 1623875721,
+        "lastModified": 1631561581,
-        "narHash": "sha256-A8BU7bjS5GirpAUv4QA+QnJ4CceLHkcXdRp4xITDB0s=",
+        "narHash": "sha256-3VQMV5zvxaVLvqqUrNz3iJelLw30mIVSfZmAaauM3dA=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "f7e004a55b120c02ecb6219596820fcd32ca8772",
+        "rev": "7e5bf3925f6fbdfaf50a2a7ca0be2879c4261d19",
         "type": "github"
       },
       "original": {
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1628865210,
+        "lastModified": 1631545603,
-        "narHash": "sha256-dB3IA8AYUQDXH+Xy/6nbv4QpIbVl88DphbcxJSUYiX4=",
+        "narHash": "sha256-aT2UoEOnlEBpMRZKBLu/OBsDNTZQS48scjcL936VSLI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a445f5829889959d65ad65e5c961d5c67e1cd677",
+        "rev": "b3083bc6933eb7fa4ee7bd4802e9f72b56f3e654",
         "type": "github"
       },
       "original": {
@@ -33,11 +33,11 @@
     },
     "nixpkgsUnstable": {
       "locked": {
-        "lastModified": 1628934079,
+        "lastModified": 1631614142,
-        "narHash": "sha256-CEYsKXNYprs/TvmB7ppkYMALXnfhEw6lg5VaEXgpoec=",
+        "narHash": "sha256-4B/qkXHPWe/1NL4enq6Qp8eNvTGtvoes1ZpnGbmlRwM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "fd9984fd9a950686e7271ecf01893987a42cdf14",
+        "rev": "071317d543205ee5f5611d391a37582f9b282240",
         "type": "github"
       },
       "original": {