ci: temporarily patch GC finalizer test

It fails in a quite stable manner after the previous commits. Let's
workaround it and fix it in the LuaJIT submodule later.

NO_DOC=no API changes
NO_CHANGELOG=no behavior changes
NO_TEST=nothing to test

.test.mk

@@ -45,6 +45,12 @@ build: configure
 
 .PHONY: run-luajit-test
 run-luajit-test:
+	# Temporary hack for an unstable LuaJIT test. To be removed in
+	# the scope of gh-9145.
+	sed -i.bak -e 's/for _ = 1, 4000 do/for _ = 1, 10000 do/' \
+		third_party/luajit/test/tarantool-tests/lj-946-print-errors-from-gc-fin-custom.test.lua
+	sed -i.bak -e 's/for _ = 1, 4000 do/for _ = 1, 10000 do/' \
+		third_party/luajit/test/tarantool-tests/lj-946-print-errors-from-gc-fin-default/script.lua
 	${LUAJIT_TEST_ENV} cmake --build ${LUAJIT_TEST_BUILD_DIR} --parallel ${NPROC} --target LuaJIT-test
 
 .PHONY: install-test-deps