[nvidia_gpu] Fix variable that was expected to be an array (#16001)

Author: jsoriano

packages/nvidia_gpu/changelog.yml

@@ -1,4 +1,9 @@
 # newer versions go on top
+- version: "0.4.1"
+  changes:
+    - description: SSL configuration is not expected to have multiple values.
+      type: bugfix
+      link: https://github.com/elastic/integrations/pull/16001
 - version: "0.4.0"
   changes:
     - description: |

packages/nvidia_gpu/data_stream/stats/agent/stream/stream.yml.hbs

@@ -15,7 +15,7 @@ metrics_filters.include:
 {{#each metrics_filters.include}}
   - {{this}}
 {{/each}}
-{{#if ssl.certificate_authorities}}
+{{#if ssl}}
 ssl:
   {{ssl}}
 {{/if}}

packages/nvidia_gpu/data_stream/stats/manifest.yml

@@ -41,7 +41,6 @@ streams:
         description: >
           Configure SSL for the Prometheus endpoint in YAML format. Use with caution as incorrect settings may cause issues with your configuration.
 
-        multi: true
         required: false
         show_user: false
       - name: username

packages/nvidia_gpu/manifest.yml

@@ -1,7 +1,7 @@
 format_version: 3.2.0
 name: nvidia_gpu
 title: "NVIDIA GPU Monitoring"
-version: 0.4.0
+version: 0.4.1
 source:
   license: "Elastic-2.0"
 description: "Monitor NVIDIA GPUs via NVIDIA Data Center GPU Manager"