fix: paramaters of type character and bit not ignoring length

- Fixes the error "value too long for type character(1)" when the char length of the parameter was bigger than one.

test/spec/Feature/Query/UpdateSpec.hs

@@ -387,14 +387,14 @@ spec actualPgVersion = do
     -- https://github.com/PostgREST/postgrest/issues/2861
     context "bit and char columns with length" $ do
       it "should update a bit column with length" $
-        request methodPatch "/bitchar_with_length?char=eq.aaaaa"
+        request methodPatch "/bitchar_with_length?select=bit,char&char=eq.aaaaa"
             [("Prefer", "return=representation")]
             [json|{"bit": "11100"}|]
           `shouldRespondWith` [json|[{ "bit": "11100", "char": "aaaaa" }]|]
             { matchStatus  = 200 }
 
       it "should update a char column with length" $
-        request methodPatch "/bitchar_with_length?bit=eq.00000"
+        request methodPatch "/bitchar_with_length?select=bit,char&bit=eq.00000"
             [("Prefer", "return=representation")]
             [json|{"char": "zzzyy"}|]
           `shouldRespondWith` [json|[{ "bit": "00000", "char": "zzzyy" }]|]