bump pyproject.toml to 1.0.2

[LandynDev]

Why

allways/__init__.py was bumped to 1.0.2 in #317 but pyproject.toml
was left at 1.0.1. Aligning the two before cutting the v1.0.2 release.

Verification

$ grep -rn "1\.0\.[12]" pyproject.toml allways/__init__.py
pyproject.toml:3:version = "1.0.2"
allways/__init__.py:1:__version__ = '1.0.2'

Smart-contract Cargo.toml stays at 1.0.0 — the contract is deployed
immutable and its source wasn't touched in this release cycle.