Update Grafana version and Selenium script

This ps updates the version to 7.4.5
The css element in GUI has changed in the new Grafana version , so updated
 the selenium script to find the right element.

Change-Id: I972fddf73719fb5bef821679a5ab07491edf55ff

grafana/Chart.yaml

@@ -12,10 +12,10 @@
 
 ---
 apiVersion: v1
-appVersion: v7.3.6
+appVersion: v7.4.5
 description: OpenStack-Helm Grafana
 name: grafana
-version: 0.1.6
+version: 0.1.7
 home: https://grafana.com/
 sources:
   - https://github.com/grafana/grafana

grafana/templates/bin/_selenium-tests.py.tpl

@@ -73,7 +73,7 @@ logger.info("Attempting to log into Grafana dashboard")
 try:
     browser.find_element_by_name('user').send_keys(username)
     browser.find_element_by_name('password').send_keys(password)
-    browser.find_element_by_class_name('css-6ntnx5-button').click()
+    browser.find_element_by_css_selector('[aria-label="Login button"]').click()
     logger.info("Successfully logged in to Grafana")
 except NoSuchElementException:
     logger.error("Failed to log in to Grafana")

grafana/values.yaml

@@ -17,7 +17,7 @@
 ---
 images:
   tags:
-    grafana: docker.io/grafana/grafana:7.3.6
+    grafana: docker.io/grafana/grafana:7.4.5
     dep_check: quay.io/airshipit/kubernetes-entrypoint:v1.0.0
     db_init: docker.io/openstackhelm/heat:stein-ubuntu_bionic
     grafana_db_session_sync: docker.io/openstackhelm/heat:stein-ubuntu_bionic

releasenotes/notes/grafana.yaml

@@ -7,4 +7,5 @@ grafana:
   - 0.1.4 Enable TLS for Grafana
   - 0.1.5 Enable TLS between Grafana and Prometheus
   - 0.1.6 Enable TLS for Grafana ingress path
+  - 0.1.7 Update Grafana version and Selenium script
 ...