fix(mimir): merged resources for chunks-cache (#18697)

**Description**
I merged the chunks-cache resources into one because yaml requires a
unique key.
⚒️ Fixes  Failing CI Pipeline

**⚙️ Type of change**

- [ ] ⚙️ Feature/App addition
- [x] 🪛 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?**
I have not changed the functionality but only moved lines. I have not
tested it.

**📃 Notes:**
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**✔️ 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
- [x] ⬆️ 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`

---

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charts/incubator/mimir/Chart.yaml

@@ -39,4 +39,4 @@ name: mimir
 sources:
   - https://grafana.com
 type: application
-version: 0.1.8
+version: 0.1.9

charts/incubator/mimir/values.yaml

@@ -144,6 +144,10 @@ mimir:
   chunks-cache:
     enabled: true
     replicas: 2
+    resources:
+      requests:
+        cpu: 20m
+        memory: 10Mi
   
   index-cache:
     enabled: true
@@ -231,11 +235,7 @@ mimir:
   
     zoneAwareReplication:
       topologyKey: 'kubernetes.io/hostname'
-  chunks-cache:
-    resources:
-      requests:
-        cpu: 20m
-        memory: 10Mi
+
   nginx:
     replicas: 1
     resources: