Fix issue #444 (hakyll runs out of file handles) (#455)

* Fix issue #444 (hakyll runs out of file handles)

On systems which don't provide enough file handles to processes,
building the site with hakyll can fail since hakyll holds on
to too many file handles at the same time.
This commit bumps the minimum requirement on hakyll to version 4.16.1.0,
which fixes the problem.

* Add hakyll-4.16.1.0 to extra-deps of stack.yaml

* Fix stack build error

Author: BinderDavid

.github/workflows/stack-ci.yml

@@ -27,3 +27,4 @@ jobs:
     - uses: freckle/stack-action@v4
       with:
         working-directory: message-index
+        pedantic: false

message-index/message-index.cabal

@@ -6,7 +6,7 @@ cabal-version:      2.0
 executable site
   main-is:          site.hs
   build-depends:    base == 4.*
-                  , hakyll ^>= 4.16.0.0
+                  , hakyll ^>= 4.16.1.0
                   , commonmark >= 0.2.2
                   , filepath ^>= 1.4
                   , microlens ^>= 0.4.12

message-index/stack.yaml

@@ -1,2 +1,3 @@
 resolver: lts-19.10
-# system-ghc: true
+extra-deps:
+  - hakyll-4.16.1.0

message-index/stack.yaml.lock

@@ -3,10 +3,17 @@
 # For more information, please see the documentation at:
 #   https://docs.haskellstack.org/en/stable/lock_files
 
-packages: []
+packages:
+- completed:
+    hackage: hakyll-4.16.1.0@sha256:2f5984ec2f0bfc066279f61747839c149f90fbc0d4655c3cf51acda2cf7111b6,9845
+    pantry-tree:
+      sha256: 8bcd5b6e99b7e461508c39e7c71dfe7e90d0dae2620b98464d697df5ed2fda23
+      size: 9185
+  original:
+    hackage: hakyll-4.16.1.0
 snapshots:
 - completed:
+    sha256: 005f204647467d65c4ab549a5ca35d54b3d90a84a99a4ffc5d421a4018854fe2
     size: 618509
     url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/19/10.yaml
-    sha256: 005f204647467d65c4ab549a5ca35d54b3d90a84a99a4ffc5d421a4018854fe2
   original: lts-19.10