Bump dart_bridge to 1.3.1 across all platform plugins

Regenerated via `dart run serious_python:gen_version_tables` after the
python-build manifest at release 20260614 was updated to point at
libdart_bridge 1.3.1
(https://github.com/flet-dev/dart-bridge/releases/tag/v1.3.1).

1.3.1 fixes:
* `__android_log_write` is now resolved via explicit `-llog` linkage,
  unblocking Android Python 3.12 (whose libpython doesn't transitively
  pull in liblog like 3.13/3.14 do). Should unstick the previously
  failing bridge_example test on the Android-Py3.12 CI matrix entry.
* `print(x)` no longer produces blank logcat / os_log entries after
  every real line — pure-whitespace writes that come from CPython's
  trailing-newline sub-call are now skipped on the native log
  branches. Desktop passthrough is unchanged.

No code changes here; just the regenerated version tables.

Author: FeodorFitsner

src/serious_python/lib/src/python_versions.dart

@@ -11,7 +11,7 @@ const dartBridgeVersionEnvironmentVariable = "DART_BRIDGE_VERSION";
 
 /// python-build release the bundled runtimes come from (YYYYMMDD).
 const pythonReleaseDate = "20260614";
-const dartBridgeVersion = "1.3.0";
+const dartBridgeVersion = "1.3.1";
 const defaultPythonVersion = "3.14";
 
 class PythonRelease {

src/serious_python_android/android/python_versions.properties

@@ -1,7 +1,7 @@
 # GENERATED by `dart run serious_python:gen_version_tables` from
 # python-build manifest.json (release 20260614). Do not edit by hand.
 default_python_version=3.14
-dart_bridge_version=1.3.0
+dart_bridge_version=1.3.1
 python_build_release_date=20260614
 3.12.full_version=3.12.13
 3.13.full_version=3.13.14

src/serious_python_darwin/darwin/python_versions.properties

@@ -1,7 +1,7 @@
 # GENERATED by `dart run serious_python:gen_version_tables` from
 # python-build manifest.json (release 20260614). Do not edit by hand.
 default_python_version=3.14
-dart_bridge_version=1.3.0
+dart_bridge_version=1.3.1
 python_build_release_date=20260614
 3.12.full_version=3.12.13
 3.13.full_version=3.13.14

src/serious_python_linux/linux/python_versions.properties

@@ -1,7 +1,7 @@
 # GENERATED by `dart run serious_python:gen_version_tables` from
 # python-build manifest.json (release 20260614). Do not edit by hand.
 default_python_version=3.14
-dart_bridge_version=1.3.0
+dart_bridge_version=1.3.1
 python_build_release_date=20260614
 3.12.full_version=3.12.13
 3.13.full_version=3.13.14

src/serious_python_windows/windows/python_versions.properties

@@ -1,7 +1,7 @@
 # GENERATED by `dart run serious_python:gen_version_tables` from
 # python-build manifest.json (release 20260614). Do not edit by hand.
 default_python_version=3.14
-dart_bridge_version=1.3.0
+dart_bridge_version=1.3.1
 python_build_release_date=20260614
 3.12.full_version=3.12.13
 3.13.full_version=3.13.14