[release-v0.26.0] Update kn-plugin-func

[dsimansk]

Midstream repo: https://github.com/openshift-knative/kn-plugin-func

Once the code cut-off is done, Func's midstream repo should contain next release branch, most probably serverless-1.20.

Produced by:

# `@release-next` version value should be replaced by `serverless-1.20` for the final update
go mod edit -replace knative.dev/kn-plugin-func=github.com/openshift-knative/kn-plugin-func@release-next
go mod tidy
go mod vendor

# cleanup
find vendor/ \( -name "OWNERS" -o -name "OWNERS_ALIASES" -o -name "BUILD" -o -name "BUILD.bazel" -o -name "*_test.go" \) -exec rm -f {} +

Sanity check:

➜  client git:(pr/release-v0.26.0-func) ./hack/build.sh -f
🚧 Compile
➜  client git:(pr/release-v0.26.0-func) kn func version         
v0.20.0

[rhuss]

/approve
/lgtm

[openshift-ci]

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This pull-request has been approved by: dsimansk, rhuss

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[openshift-ci]

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