chore(*) bump gloangci-lint version

after e4d31d, the linter does nto finish its job and complains  with
"WARN [runner] Can't run linter goanalysis_metalinter" and
"export data is newer version - update tool". This is described here
golangci/golangci-lint#893. The solution is to
use newer golangci-lint, which is done here.

Signed-off-by: Nikolay Nikolaev <nikolay.nikolaev@konghq.com>

Makefile

@@ -106,7 +106,7 @@ endif
 PROTOC_VERSION := 3.6.1
 PROTOC_PGV_VERSION := v0.3.0-java.0.20200311152155-ab56c3dd1cf9
 GOLANG_PROTOBUF_VERSION := v1.3.2
-GOLANGCI_LINT_VERSION := v1.21.0
+GOLANGCI_LINT_VERSION := v1.26.0
 
 CI_KUBEBUILDER_VERSION ?= 2.0.0
 CI_MINIKUBE_VERSION ?= v1.4.0
@@ -475,4 +475,4 @@ run/kuma-dp: ## Dev: Run `kuma-dp` locally
 
 include Makefile.kind.mk
 include Makefile.dev.mk
-include Makefile.e2e.mk
+include Makefile.e2e.mk