chore: update registry version to 3 in Taskfile (#778)

Closes #777

Signed-off-by: Gabriele Bartolini <gabriele.bartolini@enterprisedb.com>
Signed-off-by: Jonathan Gonzalez V. <jonathan.gonzalez@enterprisedb.com>
Co-authored-by: Jonathan Gonzalez V. <jonathan.gonzalez@enterprisedb.com>

Author: gbartolini

Taskfile.yml

@@ -183,7 +183,7 @@ tasks:
       - generate-certs
       - start-build-network
     env:
-      # TODO: renovate
+      # renovate: datasource=docker depName=registry versioning=semver
       REGISTRY_VERSION: 2
     cmds:
       - >