chore(deps): update dependency operator-framework/operator-sdk to v1.…

…39.0 (#61)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Makefile

@@ -48,7 +48,7 @@ endif
 
 # Set the Operator SDK version to use. By default, what is installed on the system is used.
 # This is useful for CI or a project to utilize a specific version of the operator-sdk toolkit.
-OPERATOR_SDK_VERSION ?= v1.38.0 # github-releases:operator-framework/operator-sdk
+OPERATOR_SDK_VERSION ?= v1.39.0 # github-releases:operator-framework/operator-sdk
 # Image URL to use all building/pushing image targets
 IMG ?= drpsychick/mailu-operator:$(VERSION)
 # ENVTEST_K8S_VERSION refers to the version of kubebuilder assets to be downloaded by envtest binary.