bitcoin: Use ptr::cast function intstead of manually casting

diff --git a/bitcoin/src/taproot/merkle_branch/borrowed.rs b/bitcoin/src/taproot/merkle_branch/borrowed.rs
index d28af7b5..37e6179d 100644
--- a/bitcoin/src/taproot/merkle_branch/borrowed.rs
+++ b/bitcoin/src/taproot/merkle_branch/borrowed.rs
@@ -1,4 +1,5 @@
 use core::borrow::{Borrow, BorrowMut};
+use core::slice;
 
 use internals::slice::SliceExt;
 pub use privacy_boundary::TaprootMerkleBranch;
@@ -95,11 +96,11 @@ impl TaprootMerkleBranch {
     fn decode_exact(
         nodes: &[[u8; TAPROOT_CONTROL_NODE_SIZE]],
     ) -> Result<&Self, InvalidMerkleTreeDepthError> {
-        // SAFETY:
-        // The lifetime of the returned reference is the same as the lifetime of the input
-        // reference, the size of `TapNodeHash` is equal to `TAPROOT_CONTROL_NODE_SIZE` and the
-        // alignment of `TapNodeHash` is equal to the alignment of `u8` (see tests below).
-        Self::from_hashes(unsafe { &*(nodes as *const _ as *const [TapNodeHash]) })
+        // SAFETY: `TapNodeHash` is `#[repr(transparent)]` and contains a (type which is
+        // `#[repr(transparent)]` and contains a) `[u8; 32]`.
+        Self::from_hashes(unsafe {
+            slice::from_raw_parts(nodes.as_ptr().cast::<TapNodeHash>(), nodes.len())
+        })
     }
 
     fn from_hashes(nodes: &[TapNodeHash]) -> Result<&Self, InvalidMerkleTreeDepthError> {