Make it build cleanly on GHC 8.10.7 and GHC 9.4.7

.gitignore

 .stack-work/
 crawlerISTEX.cabal
-*~
\ No newline at end of file
+*~
+dist-newstyle
+tags

cabal.ghc-9.4.7.project

+with-compiler: ghc-9.4.7
+
+packages: .
+tests: True

cabal.project

+packages: .
+with-compiler: ghc-8.10.7

crawlerISTEX.cabal

@@ -41,14 +41,14 @@ library
       RecordWildCards
       TypeOperators
   build-depends:
-      aeson
+      aeson < 2.3
     , base >=4.7 && <5
     , ghc
     , http-client
     , http-client-tls
     , lens
-    , servant
-    , servant-client
+    , servant >= 0.18.3 && < 0.20
+    , servant-client >= 0.18.3 && < 0.20
     , text
   default-language: Haskell2010
 

src/ISTEX/Client.hs

@@ -5,7 +5,6 @@ module ISTEX.Client where
 import Control.Applicative ((<|>))
 import Data.Aeson
 import GHC.Generics
-import Panic (panic)
 import Text.Read (readEither)
 
 import Servant.API
@@ -36,7 +35,7 @@ parsePubDate :: Maybe T.Text -> Maybe Int
 parsePubDate Nothing = Nothing
 parsePubDate (Just pubDate) = 
   case ePubDate of
-    Left err -> panic $ T.unpack $ "[parseJSON] Cannot parse publicationDate (Int): " <> pubDate <> "(" <> (T.pack err) <> ")"
+    Left err -> error $ T.unpack $ "[parseJSON] Cannot parse publicationDate (Int): " <> pubDate <> "(" <> (T.pack err) <> ")"
     Right pubDate' -> Just pubDate'
   where
     ePubDate = readEither (T.unpack pubDate) :: Either String Int