Bump flatpak/flatpak-github-actions from 6.2 to 6.3

Bumps [flatpak/flatpak-github-actions](https://github.com/flatpak/flatpak-github-actions) from 6.2 to 6.3.
- [Release notes](https://github.com/flatpak/flatpak-github-actions/releases)
- [Commits](https://github.com/flatpak/flatpak-github-actions/compare/v6.2...v6.3)

---
updated-dependencies:
- dependency-name: flatpak/flatpak-github-actions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/linux_build_flatpak.yml

@@ -86,7 +86,7 @@ jobs:
           flatpak run org.freedesktop.appstream-glib validate .github/workflows/scripts/linux/flatpak/net.pcsx2.PCSX2.metainfo.xml
 
       - name: Build Flatpak
-        uses: flatpak/flatpak-github-actions/flatpak-builder@v6.2
+        uses: flatpak/flatpak-github-actions/flatpak-builder@v6.3
         with:
           bundle: ${{ steps.artifact-metadata.outputs.artifact-name }}.flatpak
           manifest-path: .github/workflows/scripts/linux/flatpak/net.pcsx2.PCSX2.json
@@ -105,7 +105,7 @@ jobs:
 
       - name: Push to Flathub beta
         if: inputs.publish == true && inputs.branch == 'beta'
-        uses: flatpak/flatpak-github-actions/flat-manager@v6.2
+        uses: flatpak/flatpak-github-actions/flat-manager@v6.3
         with:
           flat-manager-url: https://hub.flathub.org/
           repository: beta
@@ -113,7 +113,7 @@ jobs:
 
       - name: Push to Flathub stable
         if: inputs.publish == true && inputs.branch == 'stable'
-        uses: flatpak/flatpak-github-actions/flat-manager@v6.2
+        uses: flatpak/flatpak-github-actions/flat-manager@v6.3
         with:
           flat-manager-url: https://hub.flathub.org/
           repository: stable