fix: redundant import (#2707)

Author: jamesmckinna

src/Data/Fin/Base.agda

@@ -11,7 +11,6 @@
 
 module Data.Fin.Base where
 
-open import Data.Bool.Base using (Bool; T)
 open import Data.Nat.Base as ℕ using (ℕ; zero; suc)
 open import Data.Product.Base as Product using (_×_; _,_; proj₁; proj₂)
 open import Data.Sum.Base as Sum using (_⊎_; inj₁; inj₂; [_,_]′)