feat(nvidia-gpu-exporter): Move to stable (#18485)

**Description**
Move nvidia-gpu-exporter to Stable train.

⚒️ Fixes  # <!--(issue)-->

**⚙️ Type of change**

- [x] ⚙️ Feature/App addition
- [ ] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code

**🧪 How Has This Been Tested?**
Testing completed on both TrueNAS-SCALE-23.10.1 & native helm. GPU
metrics successfully collected and exported into prometheus using Nvidia
Quadro M2000 card.

**📃 Notes:**
<!-- Please enter any other relevant information here -->

**✔️ Checklist:**

- [x] ⚖️ My code follows the style guidelines of this project
- [x] 👀 I have performed a self-review of my own code
- [ ] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [ ] 📄 I have made corresponding changes to the documentation
- [ ] ⚠️ My changes generate no new warnings
- [ ] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
- [ ] ⬆️ I increased versions for any altered app according to semantic
versioning

**➕ App addition**

If this PR is an app addition please make sure you have done the
following.

- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`

---

_Please don't blindly check all the boxes. Read them and only check
those that apply.
Those checkboxes are there for the reviewer to see what is this all
about and
the status of this PR with a quick glance._

charts/stable/nvidia-gpu-exporter/Chart.yaml

@@ -5,7 +5,7 @@ annotations:
   truecharts.org/category: metrics
   truecharts.org/max_helm_version: "3.13"
   truecharts.org/min_helm_version: "3.12"
-  truecharts.org/train: incubator
+  truecharts.org/train: stable
 apiVersion: v2
 appVersion: 1.2.0
 dependencies:
@@ -18,7 +18,7 @@ dependencies:
     import-values: []
 deprecated: false
 description: Prometheus exporter for Nvidia GPU's using nvidia-smi binary to gather metrics.
-home: https://truecharts.org/charts/incubator/nvidia-gpu-exporter
+home: https://truecharts.org/charts/stable/nvidia-gpu-exporter
 icon: https://truecharts.org/img/hotlink-ok/chart-icons/nvidia-gpu-exporter.png
 keywords:
   - prometheus
@@ -31,8 +31,8 @@ maintainers:
     url: https://truecharts.org
 name: nvidia-gpu-exporter
 sources:
-  - https://github.com/truecharts/charts/tree/master/charts/incubator/nvidia-gpu-exporter
+  - https://github.com/truecharts/charts/tree/master/charts/stable/nvidia-gpu-exporter
   - https://github.com/utkuozdemir/nvidia_gpu_exporter
   - https://hub.docker.com/r/utkuozdemir/nvidia_gpu_exporter
 type: application
-version: 0.0.1
+version: 1.0.0