[v10.1.x] Use latest grafana/docs-base image (#77310)

Use latest grafana/docs-base image (#77299)

* Use latest grafana/docs-base image

The pinned tag does not support recent shortcodes like `docs/public-preview`.

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Always pull the image

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

---------

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>
(cherry picked from commit d8d7a40d13)

scripts/drone/utils/images.star

@@ -29,7 +29,7 @@ images = {
     "openldap": "osixia/openldap:1.4.0",
     "drone_downstream": "grafana/drone-downstream",
     "docker_puppeteer": "grafana/docker-puppeteer:1.1.0",
-    "docs": "grafana/docs-base:dbd975af06",
+    "docs": "grafana/docs-base:latest",
     "cypress": "cypress/included:9.5.1-node16.14.0-slim-chrome99-ff97",
     "dockerize": "jwilder/dockerize:0.6.1",
     "shellcheck": "koalaman/shellcheck:stable",