update OpenSSF CII Best Practices badge

OpenSSF CII Best Practices badge is expected to be repository specific.
Our old badge is organization-wide, and does not quality for points
in OpenSSF Scorecard for example.

I've done the CII analysis for CAPM3 alone, and we have received a
passing badge for CAPM3 now.

Signed-off-by: Tuomo Tanskanen <tuomo.tanskanen@est.tech>

README.md

@@ -1,7 +1,7 @@
 # Cluster API Provider Metal3 for Managed Bare Metal Hardware
 
 [![CLOMonitor](https://img.shields.io/endpoint?url=https://clomonitor.io/api/projects/cncf/metal3-io/badge)](https://clomonitor.io/projects/cncf/metal3-io)
-[![OpenSSF Best Practices](https://www.bestpractices.dev/projects/9160/badge)](https://www.bestpractices.dev/projects/9160)
+[![OpenSSF Best Practices](https://www.bestpractices.dev/projects/9970/badge)](https://www.bestpractices.dev/projects/9970)
 [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/metal3-io/cluster-api-provider-metal3/badge)](https://securityscorecards.dev/viewer/?uri=github.com/metal3-io/cluster-api-provider-metal3)
 [![Ubuntu E2E Integration 1.9 build status](https://jenkins.nordix.org/buildStatus/icon?job=metal3-periodic-ubuntu-e2e-integration-test-release-1-9&subject=Ubuntu%20E2E%20integration%201.9)](https://jenkins.nordix.org/view/Metal3%20Periodic/job/metal3-periodic-ubuntu-e2e-integration-test-release-1-9/)
 [![CentOS E2E Integration 1.9 build status](https://jenkins.nordix.org/buildStatus/icon?job=metal3-periodic-centos-e2e-integration-test-release-1-9&subject=Centos%20E2E%20integration%201.9)](https://jenkins.nordix.org/view/Metal3%20Periodic/job/metal3-periodic-centos-e2e-integration-test-release-1-9/)