flake: Add dependency to process

package.yaml

@@ -13,12 +13,10 @@ dependencies:
   - base >= 4.13 && < 5
 #  - bytestring
 #  - time
-#  - process
 #  - directory
 
 ghc-options:
   - -Wall
-  - -Wunused-packages
   - -fdefer-typed-holes
 
 default-extensions:
@@ -30,6 +28,7 @@ library:
   source-dirs: src
   dependencies:
     - text
+    - process
   verbatim:
     default-language: GHC2021