Move test dependencies removal from fix-tests.patch to a sed

That way, the patch is easier applied for future rebases.

pyproject.toml after %prep is identical to what it was before this commit.

[skip changelog]

fix-tests.patch

@@ -9,7 +9,7 @@ Content-Transfer-Encoding: 8bit
 Co-Authored-By: Lumir Balhar <lbalhar@redhat.com>
 Co-Authored-By: Miro Hrončok <miro@hroncok.cz>
 ---
- pyproject.toml                                     | 10 +---------
+ pyproject.toml                                     | 4 +---
  src/tox/pytest.py                                  | 14 ++------------
  tests/test_provision.py                            | 11 ++++-------
  .../package/test_python_package_util.py            | 10 ++++++++--
@@ -19,26 +19,6 @@ diff --git a/pyproject.toml b/pyproject.toml
 index 6920d19..53326bc 100644
 --- a/pyproject.toml
 +++ b/pyproject.toml
-@@ -76,11 +76,6 @@ dev = [
- ]
- test = [
-   "build[virtualenv]>=1.3",
--  "covdefaults>=2.3",
--  "coverage>=7.10.7",
--  "detect-test-pollution>=1.2",
--  "devpi-process>=1.0.2",
--  "diff-cover>=9.7.1",
-   "distlib>=0.4",
-   "flaky>=3.8.1",
-   "hatch-vcs>=0.5",
-@@ -88,7 +83,6 @@ test = [
-   "pdm-backend>=2.4.5",
-   "psutil>=7.1",
-   "pytest>=8.4.2",
--  "pytest-cov>=7",
-   "pytest-mock>=3.15.1",
-   "pytest-xdist>=3.8",
-   "re-assert>=1.1",
 @@ -201,6 +195,7 @@ filterwarnings = [
    "error",
    "ignore:unclosed database in <sqlite3.Connection object at:ResourceWarning",