Merge bitcoin#34493: contrib: Remove valgrind suppression for bug 472219

fa33ace Revert "valgrind: add suppression for bug 472219" (MarcoFalke)

Pull request description:

  Now that several Alpine releases are out, it seems fine to remove this suppression.

  This should work since Alpine 3.19: https://pkgs.alpinelinux.org/packages?name=valgrind&branch=v3.19&repo=&arch=aarch64, which just dropped out of `main` support (https://alpinelinux.org/releases/)

ACKs for top commit:
  fanquake:
    ACK fa33ace

Tree-SHA512: 2a58475d20f8214c012b77efb7fe145e810a1506736341f8debea74dabd31499899a968bc2d4a88008b2a3878b4fe5e48fa14c83a2e943a91943bf0e1e159b6f

Author: fanquake

contrib/valgrind.supp

@@ -56,9 +56,3 @@
    ...
    fun:_ZN5BCLog6Logger12StartLoggingEv
 }
-{
-   Suppress https://bugs.kde.org/show_bug.cgi?id=472219 - fixed in Valgrind 3.22.
-   Memcheck:Param
-   ppoll(ufds.events)
-   obj:/lib/ld-musl-aarch64.so.1
-}