Fix flatpak and nix workflows

.github/workflows/flatpak.yml

@@ -58,5 +58,5 @@ jobs:
         uses: flatpak/flatpak-github-actions/flatpak-builder@v6
         with:
           bundle: FjordLauncher-${{ runner.os }}-${{ env.VERSION }}-Flatpak.flatpak
-          manifest-path: flatpak/org.fjordlauncher.FjordLauncher.yml
+          manifest-path: flatpak/org.unmojang.FjordLauncher.yml
           arch: ${{ matrix.arch }}

.github/workflows/nix.yml

@@ -70,7 +70,7 @@ jobs:
         if: ${{ github.event_name == 'push' || github.event_name == 'workflow_dispatch' }}
         uses: cachix/cachix-action@v15
         with:
-          name: fjordlauncher
+          name: unmojang
           authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
 
       - name: Run Flake checks