Merge pull request matplotlib#25068 from QuLogic/texlive2022

Fix pgf tests with TeXLive 2022

Author: tacaswell

lib/matplotlib/tests/baseline_images/test_backend_pgf/pgf_pdflatex.pdf

@@ -63,7 +63,7 @@ def create_figure():
 
     # text and typesetting
     plt.plot([0.9], [0.5], "ro", markersize=3)
-    plt.text(0.9, 0.5, 'unicode (ü, °, µ) and math ($\\mu_i = x_i^2$)',
+    plt.text(0.9, 0.5, 'unicode (ü, °, \N{Section Sign}) and math ($\\mu_i = x_i^2$)',
              ha='right', fontsize=20)
     plt.ylabel('sans-serif, blue, $\\frac{\\sqrt{x}}{y^2}$..',
                family='sans-serif', color='blue')