Update default resolver, explicit GHC-8.10 CI

.github/workflows/ci.yml

@@ -11,6 +11,7 @@ jobs:
       matrix:
         stack-yaml:
           - stack.yaml
+          - stack-lts-17.4.yaml
           - stack-lts-16.10.yaml
           - stack-lts-13.2.yaml
       fail-fast: false

stack-lts-17.4.yaml

@@ -0,0 +1 @@
+resolver: lts-17.4

stack-lts-17.4.yaml.lock

@@ -0,0 +1,12 @@
+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages: []
+snapshots:
+- completed:
+    size: 563103
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/17/4.yaml
+    sha256: f11e2153044f5f71ea7b1c9398f4721f517c9bd37642ed769647b896564021f3
+  original: lts-17.4

stack.yaml

@@ -1 +1 @@
-resolver: lts-16.26
+resolver: lts-17.4

stack.yaml.lock

@@ -6,7 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    size: 533252
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/26.yaml
-    sha256: cdbc5db9c1afe80a5998247939027a0c7db92fa0f20b5cd01596ec3da628b622
-  original: lts-16.26
+    size: 563103
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/17/4.yaml
+    sha256: f11e2153044f5f71ea7b1c9398f4721f517c9bd37642ed769647b896564021f3
+  original: lts-17.4