Require setuptools >= 70.1.0 to build wheel

setuptools < 70.0 have a bug in the schema definition for dynamic
optional dependencies. The issue was fixed in validate-pyproject 0.17
and setuptools 70.0.0.

70.1.0 has another fix that might be relevant for Python 3.10.

This fixes the following error message:

```
ValueError: invalid pyproject.toml config: `tool.setuptools.dynamic.optional-dependencies`.
configuration error: `tool.setuptools.dynamic.optional-dependencies` keys must be named by:

    {format: 'python-identifier'}
```

See: abravalheri/validate-pyproject#170
Signed-off-by: Christian Heimes <cheimes@redhat.com>

pyproject.toml

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 [build-system]
-requires = ["setuptools>=64", "setuptools_scm>=8"]
+requires = ["setuptools>=70.1.0", "setuptools_scm>=8"]
 build-backend = "setuptools.build_meta"
 
 [project]