Update cabal format to 3.4

flevum.cabal

@@ -1,10 +1,10 @@
-cabal-version: 2.2
+cabal-version: 3.4
 
 name: flevum
 version: 1.0
 author: Eugen Wissner
 maintainer: belka@caraus.de
-copyright:      2018-2021 Eugen Wissner
+copyright: 2018-2024 Eugen Wissner
 build-type: Simple
 
 executable flevum
@@ -14,11 +14,11 @@ executable flevum
   ghc-options: -threaded -rtsopts -with-rtsopts=-N -Wall -Werror
   build-depends:
     base >= 4.14 && < 5,
-    filepath ^>= 1.4.2,
+    filepath ^>= 1.5.3,
     hakyll ^>= 4.16.0,
-    pandoc ^>= 3.1,
+    pandoc ^>= 3.2,
     process ^>= 1.6.13,
     time,
     time-locale-compat ^>= 0.1.1,
     wai-app-static ^>= 3.1.7
-  default-language: Haskell2010
+  default-language: GHC2021