[PT1-864] Relax pragma

[SteMak]

Relax ^0.8.30 to ^0.8.27
Fix interfaces to have ^0.8.0

It would be nice to do a real revise of each file pragma and use the minimal or apply 0.8.4 / 0.8.27 rule

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Note

Low Risk
Compiler-version metadata only; no bytecode or behavior changes unless consumers compile with an older 0.8.x than previously allowed.

Overview
Relaxes Solidity compiler pragmas across contracts, mixins, libraries, and test mocks so the package can compile on older 0.8.x toolchains instead of requiring ^0.8.30.

Interfaces and general-purpose code (e.g. IRescuable, Calldata, Multicall, Rescuable, Simulator) move to ^0.8.0. Transient-storage helpers stay at ^0.8.24 (Transient, TransientUnsafe and their mocks). Reentrancy / transient-lock code stays at ^0.8.27 (ReentrancyGuard, TransientLock*, related mocks). The test WETH mock is aligned from ^0.8.15 to ^0.8.0.

No runtime logic, imports, or APIs change—only pragma solidity lines.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[BoogerWooger]

all ok