NO-JIRA: chore(tests): fix NOTEBOOK_REPO_BRANCH_BASE so it points t…

…o 2024a branch and tests fetch the right test data

Makefile

@@ -37,7 +37,7 @@ OS_ARCH=$(shell go env GOOS)/$(shell go env GOARCH)
 IMAGE_TAG		 ?= $(RELEASE)_$(DATE)
 KUBECTL_BIN      ?= bin/kubectl
 KUBECTL_VERSION  ?= v1.23.11
-NOTEBOOK_REPO_BRANCH_BASE ?= https://raw.githubusercontent.com/opendatahub-io/notebooks/main
+NOTEBOOK_REPO_BRANCH_BASE ?= https://raw.githubusercontent.com/opendatahub-io/notebooks/2024a
 REQUIRED_RUNTIME_IMAGE_COMMANDS="curl python3"
 REQUIRED_CODE_SERVER_IMAGE_COMMANDS="curl python oc code-server"
 REQUIRED_R_STUDIO_IMAGE_COMMANDS="curl python oc /usr/lib/rstudio-server/bin/rserver"