chore: require pylibsparseir 0.8.3

[shinaoka]

Summary

• require pylibsparseir>=0.8.3,<0.9.0 in pyproject.toml
• keep the conda recipe in sync with the same dependency floor

Verification

• python3 check_libsparseir_version_consistency.py
• python3 -m venv /tmp/sparse-ir-published-083
• python -m pip install -U pip setuptools wheel pytest numpy scipy
• python -m pip install -e /Users/hiroshi/projects/sparse-ir/sparse-ir
• pytest tests/ -q
• result: 95 passed, 8 skipped against published pylibsparseir 0.8.3