fix(ci): use go version of go.mod

[MaineK00n]

What did you implement:

install go version of go.mod

2024/02/28 05:28:21 Autobuilder was built with go1.21.7, environment has go1.20.14
2024/02/28 05:28:21 LGTM_SRC is /home/runner/work/vuls/vuls
2024/02/28 05:28:21 Found go.mod, enabling go modules
2024/02/28 05:28:21 The go.mod file requires version v1.21 of Go, but version v1.20.14 is installed. Consider adding an actions/setup-go step to your workflow.
go: go.mod file indicates go 1.21, but maximum version supported by tidy is 1.20

/~https://github.com/future-architect/vuls/actions/runs/8075744361/job/22063101584?pr=1856

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

2024/02/28 07:07:58 Autobuilder was built with go1.21.7, environment has go1.21.7

/~https://github.com/future-architect/vuls/actions/runs/8076575378/job/22065274478?pr=1858

Checklist:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES

Reference