Remove unused variables

[IndrajeetPatil]

These are assigned but never used.

[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 3ed2964 is merged into main:

•   :ballot_box_with_check:cache_applying: 28.3ms -> 28.2ms [-1.27%, +0.72%]
•   :ballot_box_with_check:cache_recording: 1.33s -> 1.34s [-0.46%, +1.31%]
•   :ballot_box_with_check:without_cache: 3.51s -> 3.5s [-0.63%, +0.25%]

Further explanation regarding interpretation and methodology can be found in the documentation.

[lorenzwalthert]

LGTM, thanks.