[Merged by Bors] - chore: remove unused lemmas about bit0/1

[Ruben-VandeVelde]

---

[github-actions]

PR summary eb38ce18a4

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

---

Declarations diff

- bit0_apply
- bit1_apply
- bit1_apply_eq
- bit1_apply_ne
- lift_bit0
- lift_bit1
- power_bit0
- power_bit1
-- cast_bit0
-- cast_bit1
-- coe_bit0
-- coe_bit1

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

[grunweg]

Thanks!
maintainer merge

[github-actions]

🚀 Pull request has been placed on the maintainer queue by grunweg.

[jcommelin]

Thanks 🎉

bors merge

[mathlib-bors]

Pull request successfully merged into master.

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