Bump flannel version to v0.25.6

[github-actions[bot]]

Update flannel version

Bump to latest flannel version in Dockerfile

changed lines [24] of file "/tmp/updatecli/github/rancher/image-build-flannel/Dockerfile"

v0.25.6

Release published on the 2024-08-27 17:36:39 +0000 UTC at the url https://github.com/flannel-io/flannel/releases/tag/v0.25.6

## What's Changed
* Bump github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/vpc from 1.0.958 to 1.0.963 by @dependabot in https://github.com/flannel-io/flannel/pull/2017
* Fixed values file on flannel chart by @rbrtbnfgl in https://github.com/flannel-io/flannel/pull/2036
* Updated README with latest CNI plugin version by @rbrtbnfgl in https://github.com/flannel-io/flannel/pull/2035
* Bump go.etcd.io/etcd/api/v3 from 3.5.14 to 3.5.15 by @dependabot in https://github.com/flannel-io/flannel/pull/2022
* Bump github.com/containernetworking/plugins from 1.4.1 to 1.5.1 by @dependabot in https://github.com/flannel-io/flannel/pull/2024
* Bump alpine from 20240606 to 20240807 in /images by @dependabot in https://github.com/flannel-io/flannel/pull/2029
* Bump github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common from 1.0.963 to 1.0.990 by @dependabot in https://github.com/flannel-io/flannel/pull/2038
* Bump cni-plugin to v1.5.1-flannel2 by @thomasferrandiz in https://github.com/flannel-io/flannel/pull/2041
* prepare release v0.25.6 by @thomasferrandiz in https://github.com/flannel-io/flannel/pull/2040


**Full Changelog**: https://github.com/flannel-io/flannel/compare/v0.25.5...v0.25.6

Bump to latest flannel version in Makefile

1 file(s) updated with "TAG := v0.25.6$$(BUILD_META)": * Makefile

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