Lint with nightly

While `clippy` now allows `TBD` to be used in `since` parameter of
`deprecated` attribute it is only available in the newest, nightly,
version. Switch `clippy` version to nightly to enable the `TBD` value.

.github/workflows/rust.yml

@@ -22,7 +22,6 @@ jobs:
       - name: Running test script
         env:
           DO_COV: true
-          DO_LINT: true
           AS_DEPENDENCY: false
           DO_DOCS: true
           DO_FEATURE_MATRIX: true
@@ -54,8 +53,11 @@ jobs:
         uses: actions/checkout@v4
       - name: Checkout Toolchain
         uses: dtolnay/rust-toolchain@nightly
+      - name: Install clippy
+        run: rustup component add clippy
       - name: Running test script
         env:
+          DO_LINT: true
           DO_FMT: false
           DO_BENCH: true
           AS_DEPENDENCY: false

bitcoin/src/lib.rs

@@ -171,7 +171,7 @@ mod prelude {
     pub use alloc::sync;
 
     #[cfg(any(feature = "std", test))]
-    pub use std::{string::{String, ToString}, vec::Vec, boxed::Box, borrow::{Borrow, BorrowMut, Cow, ToOwned}, slice, rc, sync};
+    pub use std::{string::{String, ToString}, vec::Vec, boxed::Box, borrow::{Borrow, BorrowMut, Cow, ToOwned}, rc, sync};
 
     #[cfg(all(not(feature = "std"), not(test)))]
     pub use alloc::collections::{BTreeMap, BTreeSet, btree_map, BinaryHeap};