[pre-commit.ci] pre-commit autoupdate (#345)

* [pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/psf/black: 22.12.0 → 23.1.0](psf/black@22.12.0...23.1.0)

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -11,7 +11,7 @@ repos:
     hooks:
     -   id: trailing-whitespace
 -   repo: https://github.com/psf/black
-    rev: 22.12.0
+    rev: 23.1.0
     hooks:
     -   id: black
 -   repo: https://github.com/cheshirekow/cmake-format-precommit

unittest/python/test_eigen_ref.py

@@ -15,7 +15,6 @@
 
 
 def test_fill_print(mat):
-
     print("print matrix:")
     printMatrix(mat)
     print("calling fill():")

unittest/python/test_return_by_ref.py

@@ -4,7 +4,6 @@
 
 
 def test_shared(mat):
-
     m_ref = mat.ref()
     m_ref.fill(0)
     m_copy = mat.copy()
@@ -26,7 +25,6 @@ def test_shared(mat):
 
 
 def test_not_shared(mat):
-
     m_ref = mat.ref()
     m_ref.fill(100.0)
     m_copy = mat.copy()