Version in base suite: 1.19.8-1+deb13u1
Base version: libheif_1.19.8-1+deb13u1
Target version: libheif_1.23.4-1~deb13u1
Base files: libheif_1.19.8-1+deb13u1.dsc
Target files: libheif_1.23.4-1~deb13u1.dsc

+W: newer-standards-version 4.7.4 (current is 4.7.2)
+W: recommended-field (in section for source) Priority [debian/control:1]