Add test for issue620

[Alan-Jowett]

This pull request includes updates to the ebpf-samples subproject and the addition of a new test case in src/test/test_verify.cpp.

• ebpf-samples: The subproject commit hash was updated, indicating that the subproject has been updated to a newer version. This could include various changes such as bug fixes, performance improvements, or new features.
• src/test/test_verify.cpp: A new test case TEST_SECTION_FAIL("build", "store_map_value_in_map.o", ".text") has been added. This test case is expected to fail, indicating a known issue where inserting a value from one map into another is not supported but should be. A link to the corresponding issue on GitHub has also been added for reference.

[coveralls]

coverage: 90.376% (+0.001%) from 90.375% when pulling 13ac43e010347dae0d29e89f068c2e3fa7782ad5 on Alan-Jowett:issue620_test into edf88e2bed6d281657a032dc38fa6e4983ab0478 on vbpf:main.