Upload to unstable to address FTBFS issues with the package

debian/changelog

-matplotlib (3.8.3-4) UNRELEASED; urgency=medium
+matplotlib (3.8.3-4) unstable; urgency=medium
 
   [ Alexandre Detiste ]
-  * Rebuild with fixed pydata-sphinx-theme (Closes: #1085259)
+  * Rebuild with fixed pydata-sphinx-theme (Addresses: #1085259)
   * Remove dependency on python3-pkg-resources (Closes: #1083475)
-  * Remove dependency on python3-sphinx-panels (Closes: #1065029)
+  * Remove dependency on python3-sphinx-panels (Addresses: #1065029)
   * Add gir1.2-gtk-4.0 to suggests (Closes: #1078759)
   * Apply Multi-Arch hint
   * Set Rules-Requires-Root: no