🩹 [Patch]: Bump Sodium dependency to version 2.2.2 (#102)

This patch updates the Sodium module dependency requirement from version
2.2.0 to 2.2.2 across the Context module.

## Changes Made

Updated the `#Requires` statements in two PowerShell functions:

- `src/functions/public/Get-Context.ps1`
- `src/functions/public/Set-Context.ps1`

Both files now specify:
```powershell
#Requires -Modules @{ ModuleName = 'Sodium'; RequiredVersion = '2.2.2' }
```

## Why This Change

This ensures the Context module uses the latest patch version of the
Sodium cryptographic library, which likely includes bug fixes and
security improvements while maintaining API compatibility.

## Verification

- ✅ Only 2 lines changed (minimal and surgical update)
- ✅ PowerShell syntax validation passed
- ✅ No other version references remain in the codebase

Fixes #101.

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---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: MariusStorhaug <[email protected]>

Author: Copilot

src/functions/public/Get-Context.ps1

@@ -1,4 +1,4 @@
-#Requires -Modules @{ ModuleName = 'Sodium'; RequiredVersion = '2.2.0' }
+#Requires -Modules @{ ModuleName = 'Sodium'; RequiredVersion = '2.2.2' }
 
 function Get-Context {
     <#

src/functions/public/Set-Context.ps1

@@ -1,4 +1,4 @@
-#Requires -Modules @{ ModuleName = 'Sodium'; RequiredVersion = '2.2.0' }
+#Requires -Modules @{ ModuleName = 'Sodium'; RequiredVersion = '2.2.2' }
 
 function Set-Context {
     <#