chore: attempt to avoid diamond in OreLocalization

[kbuzzard]

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[github-actions]

PR summary 5c2599380c

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

No declarations were harmed in the making of this PR! 🐙

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>

The doc-module for script/declarations_diff.sh contains some details about this script.

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No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[kbuzzard]

The example which inspired this (Zulip) still doesn't work:

import Mathlib

example :
    -- comes from `OreLocalization.hsmul`, depends on `SMul ℤ ℤ`
    @instHSMul ℤ (Localization (Submonoid.powers (2 : ℤ))) OreLocalization.instSMulOfIsScalarTower =
    -- comes from `OreLocalization.zsmul`, depends on `AddGroup ℤ`
    @instHSMul ℤ (Localization.Away (2 : ℤ)) SubNegMonoid.toZSMul := by
  unfold instHSMul SMul.smul SubNegMonoid.toZSMul SubNegMonoid.zsmul
  unfold OreLocalization.instSMulOfIsScalarTower
  unfold AddGroup.toSubNegMonoid OreLocalization.instAddGroupOreLocalization
  dsimp only
  unfold OreLocalization.zsmul
  rfl