Tests(fix[coverage]): Stop the omit list depending on directory depth

`tests/*/test_*.py` reaches one directory below `tests/`, and `*` does not
cross a separator, so every test file nested deeper was measured as though it
were library code. Sixty-eight already were. Because those files execute, they
report near-total coverage and lift the figure rather than lowering it: the
suite reports 84% with them counted and 78% without, so 5,530 statements of
test code were worth six points of the library's score.

`**` matches any number of nested directories, so one pattern replaces the two
that enumerated levels, and a new directory cannot silently fall outside it.
The same collapse applies to the `scripts/` entries added alongside them, which
had the same one-level ceiling.

This is the third place in this tree where a path's depth was written down and
then stopped matching when a file moved -- the others being a PEP 723
`path = ".."` and the `parents[1]` lookups in the tests themselves. Each failed
silently rather than raising.

The reported figure drops six points because it stops averaging the library
with its own test suite.

Author: tony

pyproject.toml

@@ -155,10 +155,8 @@ parallel = true
 omit = [
   "*/_compat.py",
   "docs/conf.py",
-  "scripts/*.py",
-  "scripts/*/*.py",
-  "tests/test_*.py",
-  "tests/*/test_*.py",
+  "scripts/**/*.py",
+  "tests/**/test_*.py",
 ]
 
 [tool.coverage.report]