Update Deployment Workflow with specific Xcode version (#111)

- Installing Xcode version 15.3.0
 - Installing all gems with bundler

Author: Peter-John-paystack

.github/workflows/deploy.yml

@@ -10,10 +10,20 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Build
+    
+    - name: Select Xcode Version
+      uses: maxim-lobanov/setup-xcode@v1
+      with:
+        xcode-version: '15.3.0'
+  
+    - name: Setup environment
       run: |
-        xcodebuild clean build test -scheme PaystackSDK-Package -sdk iphonesimulator17.4 -destination "OS=17.4,name=iPhone 15 Pro" -enableCodeCoverage YES CODE_SIGNING_REQUIRED=NO
-        
+        bundle install
+
+    - name: Build and Run tests
+      run: |
+        xcodebuild clean build test -scheme PaystackSDK-Package -sdk iphonesimulator17.4 -destination "OS=17.4,name=iPhone 15 Pro" -enableCodeCoverage YES CODE_SIGNING_REQUIRED=NO        
+    
     - name: setup-cocoapods
       uses: maxim-lobanov/setup-cocoapods@v1
       with: