🪲 [Fix]: Issues setting variable on Store hashtable (#4)

## Description

- Fixed an issue while setting variable on Store hashtable.

## Type of change

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [ ] 📖 [Docs]
- [x] 🪲 [Fix]
- [ ] 🩹 [Patch]
- [ ] ⚠️ [Security fix]
- [ ] 🚀 [Feature]
- [ ] 🌟 [Breaking change]

## Checklist

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas

src/Store/private/Set-StoreVariable.ps1

@@ -22,7 +22,7 @@
         if ($null -eq $Value) {
             $script:Store.Remove($Name)
         } else {
-            $script:Store.$Name = $Value
+            $script:Store["$Name"] = $Value
         }
         $script:Store | ConvertTo-Json | Set-Content -Path $script:Store.ConfigFileName -Force
     }