tox.ini: update version of black formatter tool

Allow tox to use a version of the black tool from 2024.  Having added
doc strings to protocols the black tool, using the 2024 style,  will no
longer rewrite long-ish protocol method definitions that will span
multiple lines either way from:

    def foo(a: str, b: str, c: SomethingCompletelyDifferent) -> int:
        ...

to

    def foo(
        a: str, b: str, c: SomethingCompletelyDifferent
    ) -> int: ...

Just to force the ellipsis to be on the "same line" as the definition.
This is change I find a bit unnecessary and a tad bit ugly.  I did
report this to the black team but they chose to make the change anyway.

So they've unintentionally caused me to write more doc strings. Which is
a good thing I guess. :-)

Signed-off-by: John Mulligan <[email protected]>

tox.ini

@@ -54,23 +54,23 @@ allowlist_externals =
 description = Check the formatting for the source files
 deps =
     flake8
-    black>=23, <24
+    black>=24, <25
 commands =
     flake8 sambacc tests
     black --check -v .
 
 [testenv:schemacheck]
 description = Check the JSON Schema files are valid
 deps =
-    black>=23, <24
+    black>=24, <25
     PyYAML
 commands =
     python -m sambacc.schema.tool
 
 [testenv:schemaupdate]
 description = Regenerate source files from JSON Schema file(s)
 deps =
-    black>=23, <24
+    black>=24, <25
     PyYAML
 commands =
     python -m sambacc.schema.tool --update