[CI] Fix: force maturin<1.7.6

maturin 1.7.6 adds Metadata-Version: 2.4 which breaks twine upload due
to pinned package pkginfo<1.11

See https://www.maturin.rs/changelog#176 and pypa/twine#1146

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["maturin>=1.0,<2.0"]
+requires = ["maturin>=1.0,<1.7.6"]
 build-backend = "maturin"
 
 [project]