apt-pkg/solver3.h: avoid static_assert(false)

With older compilers (g++ and clang from Bookworm), static_assert(false)
will result in:

/home/josch/git/apt/build/include/apt-pkg/solver3.h:52:24: error: static assertion failed: Cannot construct map for key type
   52 |          static_assert(false, "Cannot construct map for key type");
      |                        ^~~~~

This commit implements the terrible but more valid workaround according to:
https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2593r0.html

Original solution from here:
https://stackoverflow.com/questions/14637356/static-assert-fails-compilation-even-though-template-function-is-called-nowhere/14637534#14637534

That way, apt will compile with compilers in Bookworm again.

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