libassuan: Update to 2.5.7

update keys from upstream page

libassuan/PKGBUILD

@@ -2,18 +2,20 @@
 
 pkgbase=libassuan
 pkgname=('libassuan' 'libassuan-devel')
-pkgver=2.5.6
+pkgver=2.5.7
 pkgrel=1
 pkgdesc="A IPC library used by some GnuPG related software"
 arch=('i686' 'x86_64')
 url="https://gnupg.org/related_software/libassuan"
+msys2_repository_url='https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libassuan.git'
+msys2_pgp_keys_url='https://gnupg.org/signature_key.html'
 license=('GPL')
 makedepends=('libgpg-error-devel' 'autotools' 'gcc')
 options=('strip' 'libtool')
 source=(https://gnupg.org/ftp/gcrypt/${pkgname}/${pkgname}-${pkgver}.tar.bz2{,.sig})
-sha256sums=('e9fd27218d5394904e4e39788f9b1742711c3e6b41689a31aa3380bd5aa4f426'
+sha256sums=('0103081ffc27838a2e50479153ca105e873d3d65d8a9593282e9c94c7e6afb76'
             'SKIP')
-validpgpkeys=('6DAA6E64A76D2840571B4902528897B826403ADA') # Werner Koch (dist signing 2020)
+validpgpkeys=('AC8E115BF73E2D8D47FA9908E98E9B2D19C6C8BD') # Niibe Yutaka (GnuPG Release Key)
 
 prepare() {
   cd "${pkgname}-${pkgver}"