Pin python-build download URLs to v3.12.12

Update download URLs to use the python-build v3.12.12 release across platforms. Changes: android/build.gradle, darwin/prepare_ios.sh, darwin/prepare_macos.sh, linux/CMakeLists.txt, and windows/CMakeLists.txt now reference the v3.12.12 artifacts to ensure consistent, explicit downloads instead of relying on the variable-derived release path.

Author: FeodorFitsner

src/serious_python_android/android/build.gradle

@@ -96,7 +96,7 @@ android.defaultConfig.ndk.abiFilters.each { abi ->
     }
 
     tasks.register("downloadDistArchive_$abi", Download) {
-        src "https://github.com/flet-dev/python-build/releases/download/v${python_version}/python-android-dart-${python_version}-${abi}.tar.gz"
+        src "https://github.com/flet-dev/python-build/releases/download/v3.12.12/python-android-dart-${python_version}-${abi}.tar.gz"
         dest new File(buildDir, "python-android-${abi}.tar.gz")
     }
     tasks.register("untarFile_$abi", Copy) {

src/serious_python_darwin/darwin/prepare_ios.sh

@@ -7,7 +7,7 @@ if [ ! -d "$dist" ]; then
     mkdir -p $dist
 
     python_ios_dist_file="python-ios-dart-$python_version.tar.gz"
-    python_ios_dist_url="https://github.com/flet-dev/python-build/releases/download/v$python_version/$python_ios_dist_file"
+    python_ios_dist_url="https://github.com/flet-dev/python-build/releases/download/v3.12.12/$python_ios_dist_file"
 
     # download iOS dist
     curl -LO $python_ios_dist_url

src/serious_python_darwin/darwin/prepare_macos.sh

@@ -7,7 +7,7 @@ if [ ! -d "$dist" ]; then
     mkdir -p $dist
 
     python_macos_dist_file="python-macos-dart-$python_version.tar.gz"
-    python_macos_dist_url="https://github.com/flet-dev/python-build/releases/download/v$python_version/$python_macos_dist_file"
+    python_macos_dist_url="https://github.com/flet-dev/python-build/releases/download/v3.12.12/$python_macos_dist_file"
 
     # download macos dist
     curl -LO $python_macos_dist_url

src/serious_python_linux/linux/CMakeLists.txt

@@ -17,7 +17,7 @@ project(${PROJECT_NAME} LANGUAGES CXX)
 set(PLUGIN_NAME "serious_python_linux_plugin")
 
 set(PYTHON_PACKAGE ${CMAKE_BINARY_DIR}/python)
-set(PYTHON_URL https://github.com/flet-dev/python-build/releases/download/v${PYTHON_VERSION}/python-linux-dart-${PYTHON_VERSION}-${PYTHON_ARCH}.tar.gz)
+set(PYTHON_URL https://github.com/flet-dev/python-build/releases/download/v3.12.12/python-linux-dart-${PYTHON_VERSION}-${PYTHON_ARCH}.tar.gz)
 set(PYTHON_FILE ${CMAKE_BINARY_DIR}/python-linux-dart-${PYTHON_VERSION}-${PYTHON_ARCH}.tar.gz)
 if (NOT EXISTS ${PYTHON_FILE})
   file(DOWNLOAD ${PYTHON_URL} ${PYTHON_FILE})

src/serious_python_windows/windows/CMakeLists.txt

@@ -17,7 +17,7 @@ cmake_policy(VERSION 3.14...3.25)
 set(PLUGIN_NAME "serious_python_windows_plugin")
 
 set(PYTHON_PACKAGE ${CMAKE_BINARY_DIR}/python)
-set(PYTHON_URL "https://github.com/flet-dev/python-build/releases/download/v3.12/python-windows-for-dart-3.12.zip")
+set(PYTHON_URL "https://github.com/flet-dev/python-build/releases/download/v3.12.12/python-windows-for-dart-3.12.zip")
 set(PYTHON_FILE ${CMAKE_BINARY_DIR}/python-windows-for-dart.zip)
 if (NOT EXISTS ${PYTHON_FILE})
   file(DOWNLOAD ${PYTHON_URL} ${PYTHON_FILE})