Add a changelog entry

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+Fixed: Mesh files in COMSOL's `.mphtxt` format are often created on
+Windows and then read using deal.II on Unix. Windows uses a different
+line ending style than Linux, and this led to error messages that were
+impossible to understand because the different line ending style is
+not visible in most editors. This is now fixed: The
+GridIn::read_comsol_mphtxt() function also accepts Windows line
+endings.
+<br>
+(Wolfgang Bangerth, 2023/04/20)