Updates go-libp2p from v0.39.1 to v0.42.0.

This builds on the work to update to 0.41.1 in #13173
and validates the draft PR submitted in #13179.

Key dependency updates:
- go-yamux v4.0.2 → v5.0.1 (major version bump)
- go-datastore v0.6.0 → v0.8.2 (API compatibility)
- go-multiaddr v0.14.0 → v0.16.0
- go-ds-badger2 v0.1.3 → v0.1.5 (fixes API breaking change)
- Multiple golang.org/x/* standard library updates

All changes maintain API compatibility with existing lotus code.
Local testing shows successful compilation and unit tests pass.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* chore: update go-libp2p to v0.42.0

Updates go-libp2p from v0.39.1 to v0.42.0.

This builds on the work to update to 0.41.1 in #13173
and validates the draft PR submitted in #13179.

Key dependency updates:
- go-yamux v4.0.2 → v5.0.1 (major version bump)
- go-datastore v0.6.0 → v0.8.2 (API compatibility)
- go-multiaddr v0.14.0 → v0.16.0
- go-ds-badger2 v0.1.3 → v0.1.5 (fixes API breaking change)
- Multiple golang.org/x/* standard library updates

All changes maintain API compatibility with existing lotus code.
Local testing shows successful compilation and unit tests pass.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* chore: update CHANGELOG.md for go-libp2p v0.42.0

* chore: update Go version to 1.23.10 and remove toolchain directive

* chore: update all Go version references to 1.23.10

- Update GO_VERSION_MIN to enforce 1.23.10 minimum
- Update .go-version for version managers
- Update README.md badge and documentation
- Update installation example to use 1.23.10

This follows the lotus standard practice of updating all Go version
files together for consistency across the codebase.

* chore: update Dockerfile to use Go 1.23.10

Updates the Docker base image from golang:1.23.7-bullseye to
golang:1.23.10-bullseye to match the updated Go version requirements.

* chore: run go mod tidy to clean up unused checksums

Removes checksums for modules that are no longer needed after
the go-libp2p v0.42.0 update and Go 1.23.10 version bump.

* chore: remove .go-version from tracking and add to .gitignore

The .go-version file is developer-specific and should not be tracked
in version control. Developers can create their own local .go-version
file for their preferred Go version manager (gvm, g, etc.).

* fix(docker): update Rust version to 1.86.0 to match filecoin-ffi requirements

The filecoin-ffi submodule now requires Rust 1.86.0 as specified in rust-toolchain.toml,
but the Dockerfile was still using Rust 1.63.0, causing Docker builds to fail during
the 'make clean deps' step when trying to update the Rust toolchain.

Also add changelog entry for Go version update to 1.23.10.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

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Co-authored-by: Claude <noreply@anthropic.com>