Update to Go 1.22

[ffjlabo]

What would you like to be added:

TODO:

• [x] Update the base image of Dockerfiles and go.mod in tools/
  • [x] actions-gh-release
  • [x] actions-plan-preview
  • [x] codegen
• [x] Update the base image of Dockerfiles in docs/
• [x] Update go version in docs document.
• [x] Update env.GO_VERSION in github actions workflow definitions.
  • [x] test.yaml
  • [x] publish_image_chart.yaml
  • [x] publish_binary.yaml
  • [x] lint.yaml
  • [x] test_tool.yaml
  • [x] build.yaml
• [x] Update go.mod in the root of the repo.

memo

• docker image: golang:1.22.3-alpine3.19 https://hub.docker.com/layers/library/golang/1.22.3-alpine3.19/images/sha256-a52ec26b648564b6cef8adf7bea14348b499a32d08de3943823150ad268f0d77?context=explore
• current go's stable version: 1.22.3 https://go.dev/dl/

Why is this needed:

After Go 1.22, we don't need to consider the loop var scope. https://go.dev/blog/loopvar-preview

[ffjlabo]

I updated the TODO above. These are based on the investigation of the github action workflow definitions and previous PRs for updating go version.

workflow definitions: .github/workflows/*

to 1.20.3

• https://github.com/pipe-cd/pipecd/pull/4320
• https://github.com/pipe-cd/pipecd/pull/4378

to 1.19

• https://github.com/pipe-cd/pipecd/pull/3997
• https://github.com/pipe-cd/pipecd/pull/4222