manually update nightly version to 2026-06-11.

[apoelstra]

Clippy removed the from_iter_instead_of_collect lint due to being "problematic". I don't know that we ever used this, but we had explicitly enabled it.

Clippy also added a new needless_return_with_question_mark lint which fires numerous times throughout the crate.

Supercedes #274.

[delta1]

Just missing one callsite

diff --git a/src/pset/mod.rs b/src/pset/mod.rs
index 05ac907..5c03ca6 100644
--- a/src/pset/mod.rs
+++ b/src/pset/mod.rs
@@ -747,7 +747,7 @@ impl Decodable for PartiallySignedTransaction {

             // Maximum pset input size supported
             if inputs_len > 10_000 {
-                return Err(Error::TooLargePset);
+                return Err(Error::TooLargePset.into());
             }

             let mut inputs: Vec<Input> = Vec::with_capacity(inputs_len);