fix(plant): tsys3 GPU anchor nouveau->nvidia (driver deferred to CUDA work) [#736]

Founder ruling: proprietary nvidia driver only (needed for CUDA, version
choice his) — no nouveau. Anchor pre-flipped; sensor stays unknown until
the driver lands, then populates with zero further changes.

packages/plant_snmp.yaml

@@ -513,7 +513,7 @@ sensor:
     accept_errors: true
     unique_id: pfv_tsys3_gpu_temperature_raw
     value_template: >-
-      {% set m = value | regex_findall('(?s)nouveau.*?temp1:\s*\+?(-?\d+\.?\d*)') %}
+      {% set m = value | regex_findall('(?s)nvidia.*?temp1:\s*\+?(-?\d+\.?\d*)') %}
       {{ m | first | float if m }}
 
   - platform: snmp