stack.yaml: Fix constraint errors

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

stack.yaml

@@ -39,7 +39,15 @@ packages:
 - '.'
 # Dependency packages to be pulled from upstream that are not in the resolver
 # (e.g., acme-missiles-0.3)
-extra-deps: []
+extra-deps:
+    - ipynb-0.1
+    - lrucache-1.2.0.1
+    - pandoc-2.7
+    - pandoc-citeproc-0.16.2
+    - skylighting-0.7.7
+    - skylighting-core-0.7.7
+    - texmath-0.11.2.2
+    - hakyll-4.12.5.2
 
 # Override default flag values for local packages and extra-deps
 flags: {}