chore: fix failing test on arm64 machines

[gregmagolan]

This test is failing locally on an M3 mac. Likely would fail on a linux arm64 as well.

==================== Test output for //lib/tests/run_binary_expansions:expansions_golden_test:
1,2c1,2
< bazel-out/PLATFORM_arm64-opt/bin/lib/tests/run_binary_expansions/expansions_out
< bazel-out/PLATFORM_arm64-opt/bin/lib/tests/run_binary_expansions
---
> bazel-out/PLATFORM-opt/bin/lib/tests/run_binary_expansions/expansions_out
> bazel-out/PLATFORM-opt/bin/lib/tests/run_binary_expansions
5,6c5,6
< bazel-out/PLATFORM_arm64-opt/bin/lib/tests/run_binary_expansions/src_1
< bazel-out/PLATFORM_arm64-opt/bin/lib/tests/run_binary_expansions/src_1
---
> bazel-out/PLATFORM-opt/bin/lib/tests/run_binary_expansions/src_1
> bazel-out/PLATFORM-opt/bin/lib/tests/run_binary_expansions/src_1
9,10c9,10
< bazel-out/PLATFORM_arm64-opt/bin/lib/tests/run_binary_expansions/src_1
< bazel-out/PLATFORM_arm64-opt/bin/lib/tests/run_binary_expansions/src_1
---
> bazel-out/PLATFORM-opt/bin/lib/tests/run_binary_expansions/src_1
> bazel-out/PLATFORM-opt/bin/lib/tests/run_binary_expansions/src_1
12,14c12,14
< bazel-out/PLATFORM_arm64-opt/bin
< bazel-out/PLATFORM_arm64-opt/bin
< PLATFORM_arm64
---
> bazel-out/PLATFORM-opt/bin
> bazel-out/PLATFORM-opt/bin
> PLATFORM
FAIL: files "lib/tests/run_binary_expansions/expansions_out" and "lib/tests/run_binary_expansions/expansions_golden" differ. 
================================================================================

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Type of change

• Chore (any other change that doesn't affect source or test files, such as configuration)

Test plan

• Covered by existing test cases