ci: Workaround Windows filesystem executable bit loss

[hebasto]

Fixes https://cirrus-ci.com/task/5946581265416192:

From https://github.com/bitcoin/bitcoin
 * branch                refs/pull/26103/merge -> FETCH_HEAD
error: Your local changes to the following files would be overwritten by checkout:
	ci/lint/04_install.sh
	ci/lint/06_script.sh
	contrib/devtools/gen-manpages.py
	contrib/devtools/symbol-check.py
	contrib/signet/getcoins.py
	contrib/signet/miner
	test/functional/feature_proxy.py
	test/functional/feature_taproot.py
	test/functional/interface_rest.py
	test/functional/mining_prioritisetransaction.py
	test/functional/rpc_blockchain.py
	test/functional/rpc_fundrawtransaction.py
	test/functional/rpc_help.py
	test/functional/rpc_rawtransaction.py
	test/functional/test_framework/test_framework.py
	test/functional/test_runner.py
	test/functional/wallet_basic.py
	test/functional/wallet_bumpfee.py
	test/functional/wallet_hd.py
	test/functional/wallet_importmulti.py
	test/functional/wallet_listdescriptors.py
	test/functional/wallet_multiwallet.py
	test/functional/wallet_resendwallettransactions.py
	test/functional/wallet_sendall.py
	test/lint/lint-locale-dependence.py
Please commit your changes or stash them before you switch branches.
Aborting

[hebasto]

https://cirrus-ci.com/task/5583266525741056:

From https://github.com/bitcoin/bitcoin
 * branch                refs/pull/26249/merge -> FETCH_HEAD
HEAD is now at 240c68397 Merge b8d361ab6fa2c672a08114e20a29a12537148e2d into 4fa50dd055ca030eb69861cee8aee643ac5f7098