ci: Update amiga package paths

Author: tlsa

.github/workflows/build.yaml

@@ -122,8 +122,8 @@ jobs:
           - { toolchain: i686-w64-mingw32,     frontend: windows,  pkg-file: netsurf-installer.exe }
           - { toolchain: m5475-atari-mint,     frontend: atari,    pkg-file: nsv4e.zip, ATARIARCH: v4e }
           - { toolchain: m68k-atari-mint,      frontend: atari,    pkg-file: ns020.zip, ATARIARCH: 68020-60 }
-          - { toolchain: m68k-unknown-amigaos, frontend: amigaos3, pkg-file: netsurf.lha }
-          - { toolchain: ppc-amigaos,          frontend: amiga,    pkg-file: netsurf.lha }
+          - { toolchain: m68k-unknown-amigaos, frontend: amigaos3, pkg-file: NetSurf_Amiga/netsurf.lha }
+          - { toolchain: ppc-amigaos,          frontend: amiga,    pkg-file: NetSurf_Amiga/netsurf.lha }
           - { toolchain: x86_64-w64-mingw32,   frontend: windows,  pkg-file: netsurf-installer.exe }
 
     steps: