fix(report): set http timeout 10 sec

[kotakanbe]

What did you implement:

Vuls send HTTP requests when reporting, e.g., GitHub Security Alerts, go-cve as http server mode, etc.
But, Vuls hadn't set the HTTP timeout, so Vuls was waiting forever for the http response.

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?

./vuls report works fine

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