fix(templates): pin intel-dlstreamer to 2025.2.0 (#492)

The latest intel-dlstreamer (2026.0.0) in the DLS APT repo depends on
libopenvino-2026.0.0 and openvino-2026.0.0, but the openvino/2026
repository has not been published yet. The openvino/2025 repo only
contains packages up to version 2025.4.1.

Pin intel-dlstreamer to 2025.2.0 (the latest version compatible with
the openvino/2025 repo) in all affected deb-based templates using the
underscore syntax (intel-dlstreamer_2025.2.0), which CleanDebName
converts to apt's = version pinning format.

Affected templates:
- ubuntu24-x86_64-dlstreamer.yml
- elxr12-x86_64-dlstreamer.yml
- ubuntu24-x86_64-minimal-ptl-dls.yml

Author: arodage

image-templates/ubuntu24-x86_64-minimal-ptl-dls.yml

@@ -372,7 +372,7 @@ systemConfig:
     #dls based pkg
     - docker.io
     - docker-compose-plugin
-    - intel-dlstreamer
+    - intel-dlstreamer_2025.2.0
 
   additionalFiles:
     - local: ../additionalfiles/ptl/01-network-manager-all.yaml