Use own branch of Nuitka for tests

Refs: Nuitka/Nuitka#3578

Author: kdeldycke

requirements/nuitka.txt

@@ -1,4 +1,6 @@
-nuitka == 2.7.12
+# XXX Temporary workaround for missing RFC 3987 syntax data file in Nuitka.
+# Refs: https://github.com/Nuitka/Nuitka/pull/3578
+nuitka == "git+https://github.com/kdeldycke/Nuitka@add-missing-rfc3987-syntax-data-file"
 # Additional dependencies:
 #   - ordered-set: used by Nuitka for compilation performance
 #   - zstandard: for nuitka's onefile compression