update GHC 9.4 Stack resolver

https://www.stackage.org/lts-21.25

remove duplicate `extra-deps`

stack-lts21.yaml

@@ -1,4 +1,4 @@
-resolver: lts-21.2 # ghc-9.4
+resolver: lts-21.25
 
 packages:
   - .
@@ -49,7 +49,6 @@ extra-deps:
 - hie-bios-0.13.1
 - implicit-hie-0.1.4.0
 - monad-dijkstra-0.1.1.3
-- algebraic-graphs-0.6.1
 - retrie-1.2.2
 - stylish-haskell-0.14.4.0
 - lsp-2.3.0.0
@@ -59,11 +58,8 @@ extra-deps:
 # stan dependencies not found in the stackage snapshot
 - stan-0.1.0.2
 - clay-0.14.0
-- colourista-0.1.0.2
 - dir-traverse-0.2.3.0
 - extensions-0.1.0.0
-- relude-1.2.1.0
-- slist-0.2.1.0
 - tomland-1.3.3.2
 - trial-0.0.0.0
 - trial-optparse-applicative-0.0.0.0