fix referencing github env

Author: clangenb

.github/env

@@ -1 +1 @@
-XCODE_VERSION=15.2
+XCODE_VERSION=15.2.0

.github/workflows/ios_build_and_commit_files.yml

@@ -19,7 +19,7 @@ jobs:
       - name: prepare xcode
         uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: $XCODE_VERSION
+          xcode-version: ${{ env.XCODE_VERSION }}
 
       - name: Install flutter wrapper
         run: ./scripts/install_flutter_wrapper.sh

.github/workflows/ios_build_and_deploy.yml

@@ -22,7 +22,7 @@ jobs:
       - name: prepare xcode
         uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: $XCODE_VERSION
+          xcode-version: ${{ env.XCODE_VERSION }}
 
       - name: Install flutter wrapper
         run: ./scripts/install_flutter_wrapper.sh

.github/workflows/ios_integration_test.yml

@@ -51,7 +51,7 @@ jobs:
       - name: prepare xcode
         uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: $XCODE_VERSION
+          xcode-version: ${{ env.XCODE_VERSION }}
 
       - name: "Prepare environment for ios"
         working-directory: ./scripts