chore: bump pinned Rust toolchain to 1.95.0

[QuantumExplorer]

Summary

• `constant_time_eq@0.4.3` was published requiring rustc 1.95.0. Because `Cargo.lock` isn't tracked, every CI run resolves dependencies fresh and picks up 0.4.3, failing against the current 1.94.1 pin. All open PR CI is currently red for this reason.
• Bumps `rust-toolchain.toml` to 1.95.0 — the floor the newer transitive dep needs.
• Fixes the handful of new clippy lints this unlocks so `-D warnings` stays clean:
  • `useless_conversion`: drop redundant `.into_iter()` on `zip()`'s second operand (key-wallet psbt, sml engine)
  • `sort_by_key`: `sort_by(cmp)` → `sort_by_key` for simple keyers (sml merkle roots, chain_tip)
  • `iter_on_hashmap_values`: `map.iter().filter_map(|(_, s)| …)` → `map.values().filter_map(|s| …)` (bip158)
  • `while_let_loop`: collapse `loop { let Some(..) = .. else break; .. }` into `while let Some(..) = .. { .. }` (filters manager)

MSRV (1.89) is unchanged — the toolchain pin is the dev toolchain, not the library MSRV. The MSRV job in `.github/workflows/rust.yml` still claims to check 1.89; whether it actually does (given rust-toolchain.toml overrides `dtolnay/rust-toolchain@1.89`) is a separate pre-existing question and out of scope here.

Test plan

• `cargo check --workspace --all-features` with 1.95.0 locally
• `cargo clippy --workspace --all-features --all-targets -- -D warnings` clean
• `cargo fmt --check` clean
• CI green on this PR (the point of the bump)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

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Review profile: CHILL

Plan: Pro

Run ID: a4f1d141-1860-4a83-a65e-991b2c06378c

📥 Commits

Reviewing files that changed from the base of the PR and between 5f40cf8 and 3492fd9.

📒 Files selected for processing (7)

• dash-spv/src/chain/chain_tip.rs
• dash-spv/src/sync/filters/manager.rs
• dash/src/bip158.rs
• dash/src/sml/masternode_list/merkle_roots.rs
• dash/src/sml/masternode_list_engine/mod.rs
• key-wallet/src/psbt/mod.rs
• rust-toolchain.toml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/bump-rust-1.95

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[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 68.12%. Comparing base (5f40cf8) to head (3492fd9).
⚠️ Report is 1 commits behind head on v0.42-dev.

Files with missing lines	Patch %	Lines
key-wallet/src/psbt/mod.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           v0.42-dev     #662      +/-   ##
=============================================
+ Coverage      68.07%   68.12%   +0.05%     
=============================================
  Files            319      319              
  Lines          67661    67660       -1     
=============================================
+ Hits           46057    46094      +37     
+ Misses         21604    21566      -38     

Flag	Coverage Δ
core	75.52% <100.00%> (ø)
ffi	38.27% <ø> (+0.32%)	⬆️
rpc	20.00% <ø> (ø)
spv	85.85% <100.00%> (+0.02%)	⬆️
wallet	68.05% <66.66%> (ø)

Files with missing lines	Coverage Δ
dash-spv/src/chain/chain_tip.rs	87.03% <100.00%> (ø)
dash-spv/src/sync/filters/manager.rs	96.94% <100.00%> (+0.28%)	⬆️
dash/src/bip158.rs	94.80% <100.00%> (ø)
dash/src/sml/masternode_list/merkle_roots.rs	64.38% <100.00%> (ø)
dash/src/sml/masternode_list_engine/mod.rs	75.43% <100.00%> (ø)
key-wallet/src/psbt/mod.rs	85.44% <66.66%> (ø)

... and 19 files with indirect coverage changes