fix remaining actions typespecs

[CorneliaKelinske]

Fix for those:

lib/actions.ex:216:invalid_contract
The @spec for the function does not match the success typing of the function.

Function:
EctoShorts.Actions.find_and_update/4

Success typing:
@spec find_and_update(Ecto.Query | Ecto.Schema, map(), _, Keyword.t()) :: {:error, _} | {:ok, %{atom() => _}}

lib/actions.ex:240:invalid_contract
The @spec for the function does not match the success typing of the function.

Function:
EctoShorts.Actions.find_and_upsert/4

Success typing:
@spec find_and_upsert(Ecto.Query | Ecto.Schema, map(), _, Keyword.t()) :: {:error, _} | {:ok, %{atom() => _}}

The function call will not succeed.

EctoShorts.Actions.delete(_schema_data :: maybe_improper_list(), [{:repo, _}, ...])

breaks the contract
Contract head:
(schema_data :: Ecto.Schema.t(), opts()) ::
  {:ok, Ecto.Schema.t()} | {:error, Ecto.Changeset.t()}

Contract head:
(schema :: Ecto.Schema.t(), id :: integer()) ::
  {:ok, Ecto.Schema.t()} | {:error, Ecto.Changeset.t()}

in 1st argument

________________________________________________________________________________
lib/actions.ex:397:invalid_contract
The @spec for the function does not match the success typing of the function.

Function:
EctoShorts.Actions.delete/3

Success typing:
@spec delete(Ecto.Query | Ecto.Schema, binary() | integer(), Keyword.t()) :: any()