hooks: exclude setuptools_scm from gbulb and travertino

`gbulb` and `travertino` (dependencies of `toga`) attempt to query
their version via `setuptools_scm` before reading their metadata
(which, in their case, is automatically collected because `version`
is called with constant argument).

So exclude `setuptools_scm` to avoid unnecessarily colleceting it.

_pyinstaller_hooks_contrib/stdhooks/hook-gbulb.py

@@ -0,0 +1,14 @@
+# ------------------------------------------------------------------
+# Copyright (c) 2024 PyInstaller Development Team.
+#
+# This file is distributed under the terms of the GNU General Public
+# License (version 2.0 or later).
+#
+# The full license is available in LICENSE, distributed with
+# this software.
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+# ------------------------------------------------------------------
+
+# Prevent this package from pulling `setuptools_scm` into frozen application, as it makes no sense in that context.
+excludedimports = ["setuptools_scm"]

_pyinstaller_hooks_contrib/stdhooks/hook-travertino.py

@@ -0,0 +1,14 @@
+# ------------------------------------------------------------------
+# Copyright (c) 2024 PyInstaller Development Team.
+#
+# This file is distributed under the terms of the GNU General Public
+# License (version 2.0 or later).
+#
+# The full license is available in LICENSE, distributed with
+# this software.
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+# ------------------------------------------------------------------
+
+# Prevent this package from pulling `setuptools_scm` into frozen application, as it makes no sense in that context.
+excludedimports = ["setuptools_scm"]