Switch Xcode version to 15.4.0

Author: arik-so

.github/workflows/build-xcframework-parallel-archives.yml

@@ -34,14 +34,14 @@ jobs:
                     -   destination: 'macOS,variant=Mac Catalyst'
                         human_readable_platform: 'catalyst'
         env:
-            DEVELOPER_DIR: /Applications/Xcode_16.2.0.app/Contents/Developer
+            DEVELOPER_DIR: /Applications/Xcode_15.4.0.app/Contents/Developer
             LDK_C_BINDINGS_BASE: ${{ github.workspace }}/bindings/artifacts/ldk-c-bindings
             LDK_C_BINDINGS_BINARY_DIRECTORY: ${{ github.workspace }}/bindings/artifacts/bin
         steps:
             -   name: Configure Xcode
                 uses: maxim-lobanov/setup-xcode@v1
                 with:
-                    xcode-version: latest
+                    xcode-version: 15.4.0
             -   name: Print Xcode SDK availability
                 shell: bash
                 run:
@@ -71,13 +71,13 @@ jobs:
         runs-on: macos-latest
         needs: [ build-xcarchives ]
         env:
-            DEVELOPER_DIR: /Applications/Xcode_16.2.0.app/Contents/Developer
+            DEVELOPER_DIR: /Applications/Xcode_15.4.0.app/Contents/Developer
             LDK_C_BINDINGS_BASE: ${{ github.workspace }}/bindings/artifacts/ldk-c-bindings
         steps:
             -   name: Configure Xcode
                 uses: maxim-lobanov/setup-xcode@v1
                 with:
-                    xcode-version: latest
+                    xcode-version: 15.4.0
             -   name: Checkout
                 uses: actions/checkout@v3
             -   name: Download xcarchives

.github/workflows/build-xcframework-parallel-libldk.yml

@@ -22,7 +22,7 @@ jobs:
         name: Build & lipo libldk.a for ${{ matrix.configuration['human_readable_platform'] }}
         runs-on: macos-latest
         env:
-            DEVELOPER_DIR: /Applications/Xcode_16.2.0.app/Contents/Developer
+            DEVELOPER_DIR: /Applications/Xcode_15.4.0.app/Contents/Developer
             LDK_C_BINDINGS_BASE: ${{ github.workspace }}/bindings/artifacts/ldk-c-bindings
         strategy:
             fail-fast: true
@@ -49,7 +49,7 @@ jobs:
                 if: matrix.configuration['human_readable_platform'] == 'catalyst'
                 uses: maxim-lobanov/setup-xcode@v1
                 with:
-                    xcode-version: latest
+                    xcode-version: 15.4.0
             -   name: Checkout
                 uses: actions/checkout@v3
             -   name: Install Dependencies
@@ -77,13 +77,13 @@ jobs:
         needs: [ build-libldks ]
         runs-on: macos-latest
         env:
-            DEVELOPER_DIR: /Applications/Xcode_16.2.0.app/Contents/Developer
+            DEVELOPER_DIR: /Applications/Xcode_15.4.0.app/Contents/Developer
             LDK_C_BINDINGS_BASE: ${{ github.workspace }}/bindings/artifacts/ldk-c-bindings
         steps:
             -   name: Configure Xcode
                 uses: maxim-lobanov/setup-xcode@v1
                 with:
-                    xcode-version: latest
+                    xcode-version: 15.4.0
             -   name: Checkout
                 uses: actions/checkout@v3
             -   name: Download libldks

.github/workflows/direct-bindings-app-tests.yml

@@ -41,7 +41,7 @@ jobs:
     - name: Configure Xcode
       uses: maxim-lobanov/setup-xcode@v1
       with:
-        xcode-version: latest
+        xcode-version: 15.4.0
     - name: Checkout
       uses: actions/checkout@v2
     - name: Install Dependencies

.github/workflows/release-framework.yml

@@ -18,13 +18,13 @@ jobs:
         name: Generate XCFramework
         runs-on: macos-latest
         env:
-            DEVELOPER_DIR: /Applications/Xcode_16.2.0.app/Contents/Developer
+            DEVELOPER_DIR: /Applications/Xcode_15.4.0.app/Contents/Developer
             LDK_C_BINDINGS_BASE: ${{ github.workspace }}/bindings/artifacts/ldk-c-bindings
         steps:
             -   name: Configure Xcode
                 uses: maxim-lobanov/setup-xcode@v1
                 with:
-                    xcode-version: latest
+                    xcode-version: 15.4.0
             -   name: Checkout
                 uses: actions/checkout@v3
             -   name: Update Package.swift tag to ${{ github.event.inputs.tag }}