gnu: Rename qtbase to qtbase-5.

This change was automated via the following command:

$ git ls-files | xargs sed -i 's/,qtbase)/,qtbase-5)/g'
$ git ls-files | xargs sed -i 's/inherit qtbase)/inherit qtbase-5)/g'
$ git ls-files | xargs sed -i 's/package-version qtbase)/package-version qtbase-5)/g'
$ git checkout etc    # to clear some spurious changes

This is done so the qtbase package can be upgraded to version 6 in the
following commit.

gnu/packages/compression.scm

@@ -2211,7 +2211,7 @@ download times, and other distribution and storage costs.")
     (native-inputs
      `(("doxygen" ,doxygen)))
     (inputs
-     `(("qtbase" ,qtbase)
+     `(("qtbase" ,qtbase-5)
        ("zlib" ,zlib)))
     (home-page "https://stachenov.github.io/quazip/index.html")
     (synopsis "Qt/C++ wrapper for Minizip")