Bump flannel CNI version to v1.5.1-flannel1

[github-actions]

Update flannel CNI binary version

Bump to latest flannel CNI version in Dockerfile

changed lines [21] of file "/tmp/updatecli/github/rancher/image-build-cni-plugins/Dockerfile"

v1.5.1-flannel1

Release published on the 2024-06-24 13:11:47 +0000 UTC at the url https://github.com/flannel-io/cni-plugin/releases/tag/v1.5.1-flannel1

## What's Changed
* Bump github.com/onsi/gomega from 1.32.0 to 1.33.0 by @dependabot in https://github.com/flannel-io/cni-plugin/pull/76
* Bump github.com/onsi/ginkgo/v2 from 2.17.1 to 2.17.2 by @dependabot in https://github.com/flannel-io/cni-plugin/pull/78
* Bump github.com/onsi/gomega from 1.33.0 to 1.33.1 by @dependabot in https://github.com/flannel-io/cni-plugin/pull/79
* Bump github.com/containernetworking/plugins from 1.4.1 to 1.5.0 by @dependabot in https://github.com/flannel-io/cni-plugin/pull/82
* Bump github.com/onsi/ginkgo/v2 from 2.17.2 to 2.19.0 by @dependabot in https://github.com/flannel-io/cni-plugin/pull/83
* Bump github.com/containernetworking/cni from 1.1.2 to 1.2.0 by @dependabot in https://github.com/flannel-io/cni-plugin/pull/77
* Bump github.com/containernetworking/plugins from 1.5.0 to 1.5.1 by @dependabot in https://github.com/flannel-io/cni-plugin/pull/87
* Bump github.com/containernetworking/cni from 1.2.0 to 1.2.1 by @dependabot in https://github.com/flannel-io/cni-plugin/pull/86
* Bump Go version by @zhangguanzhang in https://github.com/flannel-io/cni-plugin/pull/85
* Bump alpine from 20240329 to 20240606 by @dependabot in https://github.com/flannel-io/cni-plugin/pull/84

## New Contributors
* @zhangguanzhang made their first contribution in https://github.com/flannel-io/cni-plugin/pull/85

**Full Changelog**: https://github.com/flannel-io/cni-plugin/compare/v1.4.1-flannel1...v1.5.1-flannel1

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