dev-python/astroid: remove outdated workaround

Introduced in 4681c2cb27. Upstream has
since updated to use `[project]` metadata instead.

```
 * SED: the following did not cause any changes
 *     sed -i -e '/license-files.*Keep in sync/d' pyproject.toml || die
 * no-op: -e /license-files.*Keep in sync/d
```

Signed-off-by: Eli Schwartz <eschwartz@gentoo.org>

dev-python/astroid/astroid-3.3.10.ebuild

@@ -39,13 +39,6 @@ distutils_enable_tests pytest
 
 export SETUPTOOLS_SCM_PRETEND_VERSION=${PV}
 
-src_prepare() {
-	distutils-r1_src_prepare
-
-	# https://bugs.gentoo.org/951713
-	sed -i -e '/license-files.*Keep in sync/d' pyproject.toml || die
-}
-
 python_test() {
 	local EPYTEST_IGNORE=()
 	local EPYTEST_DESELECT=(