chore: update pre-commit hooks (#638)

<!--pre-commit.ci start-->
updates:
- [github.com/astral-sh/ruff-pre-commit: v0.6.2 →
v0.6.3](astral-sh/ruff-pre-commit@v0.6.2...v0.6.3)
<!--pre-commit.ci end-->

---------

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

.pre-commit-config.yaml

@@ -17,7 +17,7 @@ repos:
       - id: trailing-whitespace
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: "v0.6.2"
+    rev: "v0.6.3"
     hooks:
       - id: ruff
         args: ["--fix", "--show-fixes"]

examples/tanh.py

@@ -26,13 +26,13 @@ def tanh(x):
 ### Plotting
 plt.figure(figsize=(12, 8))
 x = np.linspace(-7, 7, 700)
-plt.plot(x, tanh(x), label='tanh(x)')
+plt.plot(x, tanh(x), label="tanh(x)")
 plt.plot(x, egrad(tanh)(x), label="1st derivative")
 plt.plot(x, egrad(egrad(tanh))(x), label="2nd derivative")
 plt.plot(x, egrad(egrad(egrad(tanh)))(x), label="3rd derivative")
 plt.plot(x, egrad(egrad(egrad(egrad(tanh))))(x), label="4th derivative")
-plt.xlabel('x')
-plt.ylabel('y')
+plt.xlabel("x")
+plt.ylabel("y")
 plt.ylim(-5, 5)
 plt.yticks(np.arange(-5, 6, 1))
 plt.legend()