Selenium suite workflow: updates for 2024

1. Use Elixir 1.17.x
2. Run only when several relevant code paths change
3. Do not run when unrelated core server tests change

(cherry picked from commit 376cff0)

Author: michaelklishin

.github/workflows/test-authnz.yaml

@@ -3,12 +3,13 @@ on:
   push:
     branches:
       - main
-      - v3.12.x
-      - v3.11.x
+      - v4.0.x
     paths:
-      - 'deps/rabbit/**'
+      - 'deps/rabbit/src/rabbit_auth**'
+      - 'deps/rabbit/src/rabbit_access_control**'
       - 'deps/rabbitmq_auth_**'
-      - 'deps/rabbitmq_management/selenium/**'
+      - 'deps/rabbitmq_management/src/**'
+      - 'deps/rabbitmq_management/priv/**'
       - 'scripts/**'
       - .bazelrc
       - .bazelversion
@@ -40,7 +41,7 @@ jobs:
         - chrome
         include:
         - erlang_version: "26.2"
-          elixir_version: 1.15.7
+          elixir_version: 1.17.3
     env:
       SELENIUM_DIR: selenium
       DOCKER_NETWORK: rabbitmq_net