Fix lint warnings

[sile]

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[Copilot]

Pull Request Overview

This PR fixes several lint warnings by simplifying assertions, removing redundant parentheses, updating lifetime annotations in trait implementations, and modernizing CI workflow steps.

• Converted binary assertions (assert_eq!(…)) on booleans into assert!(…)
• Removed unnecessary parentheses in slice copy operations
• Updated CI configuration to use newer GitHub Actions versions and streamlined steps

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/null.rs	Replaced assert_eq!(…, true) with assert!(…) for clarity
src/io.rs	Removed redundant parentheses in slice copying operations
src/encode.rs	Removed needless lifetime parameters and corrected doc comment history
src/decode.rs	Removed needless lifetime parameters and updated doc comment history
src/combinator.rs	Simplified assertions and use of is_some_and for readability
src/bytes.rs	Removed redundant parentheses for cleaner slice copying operations
.github/workflows/ci.yml	Updated checkout and toolchain installation steps and CI triggers

Comments suppressed due to low confidence (1)

.github/workflows/ci.yml:3

• Verify that removing the pull_request trigger was intentional; if PR-based workflows are still desired, consider reintroducing the pull_request event.

on: [push]