add a changelog entry

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+Updated: deal.II no longer exports the -fPIC/-fpic compiler flags for
+compiling relocatable, position independent code. This should have minimal
+impact on user projects because CMake is handling the -fPIC/-fpic
+automatically. But for some less common scenarios in user projects (e.g.,
+object targets) it might be necessary to set the POSITION_INDEPENDENT_CODE
+target property in CMake.
+<br>
+(Matthias Maier, 2023/03/29)