chore: Ignore section.ARM.attributes in linker-diff

[lapla-cogito]

Recent toolchain changes seem to have caused the ARM.attributes section to be output. See this run: https://github.com/davidlattimore/wild/actions/runs/21901730592/job/63231472110

---- integration_test::program_name_096___section_start_c__ stdout ----
wild: /__w/wild/wild/wild/tests/build/section-start.c/section-start-aarch64/section-start.c.wild
ld: /__w/wild/wild/wild/tests/build/section-start.c/section-start-aarch64/section-start.c.ld
section.ARM.attributes
  wild Section missing
  ld OK