rust-toolchain: Update nightly toolchain (1.95.0) [Rebase & FF]

[makubacki]

Description

Closes #1519

The previous nightly toolchain was from 2026-02-13, which had partial support for some of the changes that ended up in Rust 1.95.0. This updates the toolchain to the same day the 1.95.0 stable tag was created.

Also fixes clippy issues reported after the update.

• Impacts functionality?
• Impacts security?
• Breaking change?
• Includes tests?
• Includes documentation?

How This Was Tested

• cargo make all with the updated toolchain

Integration Instructions

• N/A

[patina-automation]

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
patina_dxe_core/src/allocator.rs	50.00%	2 Missing ⚠️

📢 Thoughts on this report? Let us know!

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR performs a small Rust toolchain bump and includes a handful of code cleanups (mostly iterator/match simplifications) plus minor test adjustments.

Changes:

• Bump the pinned Rust nightly toolchain version.
• Simplify iteration patterns (values() instead of destructuring keys; remove redundant into_iter() usage).
• Refactor match arms to use guards for clearer conditional execution.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
sdk/patina_ffs/src/volume.rs	Test loop iteration simplified by relying on IntoIterator for the second zipped collection.
rust-toolchain.toml	Updates the pinned nightly toolchain date/version.
patina_dxe_core/src/protocol_db.rs	Uses values() to avoid unnecessary key destructuring when collecting registered protocols.
patina_dxe_core/src/allocator/fixed_size_block_allocator.rs	Test computation uses allocated_address directly (removing an explicit cast).
patina_dxe_core/src/allocator.rs	Uses match guards (if res.is_ok()) to reduce nesting around MAT installation.

[makubacki]

Fyi, I'm going to override the test coverage requirement for this since two lines are missing in allocator.rs that are unrelated to the change. Adding tests would also complicate merging other more meaningful work-in-progress in allocator.

[makubacki]

Also, since this is bumping the Rust toolchain (although not by much), I will leave it open for a few days for feedback per the update process.