niv nixpkgs: update 29eddfc3 -> 0b1657a2

## Changelog for nixpkgs:
Commits: [NixOS/nixpkgs@29eddfc3...0b1657a2](NixOS/nixpkgs@29eddfc...0b1657a)

* [`42cca0d8`](NixOS/nixpkgs@42cca0d) mariadb-connector-c: add mysqlclient.pc pkgconfig symlink
* [`5e24f4b3`](NixOS/nixpkgs@5e24f4b) openssl(_1_1): patch CVE-2019-1551
* [`0e5ef8c4`](NixOS/nixpkgs@0e5ef8c) openssl: 1.1.1d -> 1.1.1f
* [`3b383195`](NixOS/nixpkgs@3b38319) go_1_14: 1.14 -> 1.14.1
* [`6e14cf0e`](NixOS/nixpkgs@6e14cf0) itstool: fix double-shebang issue on macOS
* [`7601af23`](NixOS/nixpkgs@7601af2) itstool: use wrapPython to fix double shebang on macOS
* [`d815dc4b`](NixOS/nixpkgs@d815dc4) Merge NixOS/nixpkgs#84273: gnutls: 3.6.12 -> 3.6.13 [security]
* [`6570f2ae`](NixOS/nixpkgs@6570f2a) haskellPackages.amqp-utils: fix amqp-0.19 dependency
* [`3c700b8a`](NixOS/nixpkgs@3c700b8) cargo-make: 0.30.2 -> 0.30.4
* [`4291ef9b`](NixOS/nixpkgs@4291ef9) prometheus-wireguard-exporter: 3.2.4 -> 3.3.0
* [`c5a806cf`](NixOS/nixpkgs@c5a806c) haskellPackages.pandoc-crossref: downgrade to latest working
* [`5b340635`](NixOS/nixpkgs@5b34063) tmuxPlugins: upgrade all to latest

nix/sources.json

@@ -13,13 +13,14 @@
     },
     "nixpkgs": {
         "branch": "release-20.03",
+        "description": "Nix Packages collection",
         "homepage": "https://github.com/NixOS/nixpkgs",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "29eddfc36d720dcc4822581175217543b387b1e8",
-        "sha256": "1gqv2m7plkladd3va664xyqb962pqs4pizzibvkm1nh0f4rfpxvy",
+        "rev": "0b1657a27810f0f39db56b635eb792b6d397e6b2",
+        "sha256": "0n4yrz4mybvw2a3s79hjz1ddv369yp1ajg7gm2kwb18syi28f13a",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/29eddfc36d720dcc4822581175217543b387b1e8.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/0b1657a27810f0f39db56b635eb792b6d397e6b2.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs-static": {