[Release-1.28] - Drop flannel/cni-plugin from our fork of containernetworking/plugins

[brandond]

Backport fix for Drop flannel/cni-plugin from our fork of containernetworking/plugins

• Drop flannel/cni-plugin from our fork of containernetworking/plugins #9636

[mdrahman-suse]

Validation on release-1.28 branch with commit 31ee850

• Followed steps mentioned here: Drop flannel/cni-plugin from our fork of containernetworking/plugins #9636 (comment)

Replication

$ k3s -v
k3s version v1.28.7+k3s1 (051b14b2)
go version go1.21.7

$ /var/lib/rancher/k3s/data/current/bin/cni
CNI plugins plugin v1.4.0-k3s2
CNI protocol versions supported: 0.1.0, 0.2.0, 0.3.0, 0.3.1, 0.4.0, 1.0.0

$ /var/lib/rancher/k3s/data/current/bin/flannel
CNI Plugin flannel version v0.24.2 (linux/amd64) commit HEAD built on 2024-02-29T20:36:21Z
CNI protocol versions supported: 0.1.0, 0.2.0, 0.3.0, 0.3.1, 0.4.0, 1.0.0

Validation

$ k3s -v
k3s version v1.28.7+k3s-31ee8501 (31ee8501)
go version go1.21.7

$ /var/lib/rancher/k3s/data/current/bin/cni
CNI plugins plugin v1.4.0-k3s2
CNI protocol versions supported: 0.1.0, 0.2.0, 0.3.0, 0.3.1, 0.4.0, 1.0.0

$ /var/lib/rancher/k3s/data/current/bin/flannel
CNI Plugin flannel version v1.4.0-flannel1+v0.24.2 (linux/amd64) commit HEAD built on 2024-03-08T19:14:56Z
CNI protocol versions supported: 0.1.0, 0.2.0, 0.3.0, 0.3.1, 0.4.0, 1.0.0