Feat/upgrade go version and all dependencies

[sillygod]

Subject

Upgrade goalng and caddy2

Description

• upgrade golang version to 1.20
• bump caddy2 version to 2.6.4
• upgrade some dependencies
• fix some incompatible upgrade

[codeclimate[bot]]

Code Climate has analyzed commit 73d28fc0 and detected 2 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Duplication	2

The test coverage on the diff in this pull request is 79.1% (30% is the threshold).

This pull request will bring the total coverage in the repository to 61.5% (-14.0% change).

View more on Code Climate.