docs: use new openssf scorecard link in README.md

[terriko]

The latest update to scorecard mentioned that there's a nicer viewer for the scorecard data now. Our link is here: https://securityscorecards.dev/viewer/?uri=github.com/intel/cve-bin-tool

It would probably be a nice replacement for the link currently in README.md which is https://api.securityscorecards.dev/projects/github.com/intel/cve-bin-tool which just gives a giant fairly unreadable wall of data.

This should be a one-line fix and would be suitable for a new contributor, so here's the new contributor tips:

Short tips for new contributors:

• cve-bin-tool's contributor docs
• If you've contributed to open source but not this project, you might just want our checklist for a great pull request
• cve-bin-tool uses https://www.conventionalcommits.org/ style for commit messages, and we have a test that checks the title of your pull request (PR). A good potential title for this one is in the title of this issue.
• You can make an issue auto close by including a comment "fixes #ISSUENUMBER" in your PR comments where ISSUENUMBER is the actual number of the issue. This "links" the issue to the pull request.

Claiming issues:

• You do not need to have an issue assigned to you before you work on it. To "claim" an issue either make a linked pull request or comment on the issue saying you'll be working on it.
• If someone else has already commented or opened a pull request, assume it is claimed and find another issue to work on.
• If it's been more than 1 week without progress, you can ask in a comment if the claimant is still working on it before claiming it yourself (give them at least 3 days to respond before assuming they have moved on).

[yr1404]

I'd like to work on this issue. Please assign it to me.

[chillerno1]

I've updated the badge link and submitted a PR. Let me know if there's anything further required.