build: bump to LTS 18.16

Update the `stack.yaml` files and nix package descriptions.

I reran the code generator for the example and regenerated golden tests. Everything stayed
stable.

Author: thomasbach-dev

example/stack.yaml

@@ -17,7 +17,7 @@
 #
 # resolver: ./custom-snapshot.yaml
 # resolver: https://example.com/snapshots/2018-01-01.yaml
-resolver: lts-16.12
+resolver: lts-18.16
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.

example/stack.yaml.lock

@@ -6,7 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    size: 532377
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/12.yaml
-    sha256: f914cfa23fef85bdf895e300a8234d9d0edc2dbec67f4bc9c53f85867c50eab6
-  original: lts-16.12
+    size: 586286
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/18/16.yaml
+    sha256: cdead65fca0323144b346c94286186f4969bf85594d649c49c7557295675d8a5
+  original: lts-18.16

nix/sources.json

@@ -36,15 +36,15 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {
-        "branch": "nixos-20.09",
+        "branch": "nixos-21.11",
         "description": "Nix Packages collection",
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c85e2a478c26cfd77d1445169e51475afe9cc7cd",
-        "sha256": "049vq5xgaq78pzsygmlzfjqbv7qax0npxqvnsdyjdlaqyx4k03x5",
+        "rev": "e34c5379866833f41e2a36f309912fa675d687c7",
+        "sha256": "15shzr1wmc5770kblvlfwq5dsdlmvkpc3rhkn40nyi00fidqq96v",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/c85e2a478c26cfd77d1445169e51475afe9cc7cd.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/e34c5379866833f41e2a36f309912fa675d687c7.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "pre-commit-hooks": {

stack.yaml

@@ -1,4 +1,4 @@
-resolver: lts-16.12
+resolver: lts-18.16
 packages:
 - openapi3-code-generator
 nix:

stack.yaml.lock

@@ -58,7 +58,7 @@ packages:
     url: https://github.com/NorfairKing/safe-coloured-text/archive/bd8700a555e977004e2dec24e12494a5a01ca500.tar.gz
 snapshots:
 - completed:
-    size: 532377
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/12.yaml
-    sha256: f914cfa23fef85bdf895e300a8234d9d0edc2dbec67f4bc9c53f85867c50eab6
-  original: lts-16.12
+    size: 586286
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/18/16.yaml
+    sha256: cdead65fca0323144b346c94286186f4969bf85594d649c49c7557295675d8a5
+  original: lts-18.16