upgrade to pelletier/go-toml v2 (closes #648 #124)

[nocive]

closes #648 & #124

[gemini-code-assist]

Summary of Changes

Hello @nocive, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on a significant dependency upgrade, moving the project from pelletier/go-toml v1 to v2. This upgrade necessitated changes to module import paths across several configuration-related files and adaptations to the go-toml library's Encoder API. The vendored code has been completely refreshed to reflect the new major version.

Highlights

• Dependency Upgrade: The github.com/pelletier/go-toml library has been upgraded from version v1.9.5 to v2.2.4. This is a major version upgrade, indicating significant changes and potential breaking API modifications.
• Module Path Update: All import statements referencing github.com/pelletier/go-toml have been updated to github.com/pelletier/go-toml/v2 to reflect the new major version's module path.
• API Adaptations: Existing code interacting with the go-toml library's Encoder has been updated to align with the new API in v2. Specifically, Encoder.ArraysWithOneElementPerLine was replaced by Encoder.SetArraysMultiline, and Encoder.Order(toml.OrderPreserve) and Encoder.SetTagCommented("false") calls were removed due to API changes in the new version.
• Vendored Code Replacement: The entire vendored directory for github.com/pelletier/go-toml (v1) has been removed and replaced with the new v2 version, including all its internal files, documentation, and build scripts.

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[gemini-code-assist]

Code Review

This pull request upgrades the pelletier/go-toml dependency from version 1 to version 2. The changes include updating the go.mod and go.sum files, changing import paths across several files in the pkg/cfg package, and adapting the code to the new API of go-toml/v2. Specifically, encoder option setting methods have been updated. The vendored dependency has also been updated accordingly. The changes are straightforward and correctly implement the upgrade. I've reviewed the API changes and they seem correct. The pull request looks good to merge.