fix(update-flathub): do not add changelog

.github/workflows/__call-update-flathub-repo.yml

@@ -136,40 +136,6 @@ jobs:
             "https://raw.githubusercontent.com/LizardByte/.github/master/.github/ISSUE_TEMPLATE/config.yml" \
             ".github/ISSUE_TEMPLATE/config.yml"
 
-      - name: Update metainfo.xml
-        id: update_metainfo
-        if: >-
-          steps.check-label.outputs.hasTopic == 'true' &&
-          steps.check-release.outputs.isLatestRelease == 'true'
-        env:
-          CHANGELOG: ${{ github.event.release.body }}
-        run: |
-          # Set the metainfo file and placeholder generated by the release asset.
-          xml_file="flathub/${{ env.FLATHUB_PKG }}/${{ env.FLATHUB_PKG }}.metainfo.xml"
-          placeholder="<!-- changelog -->"
-
-          # Treat replacement text literally during Bash parameter substitutions.
-          shopt -u patsub_replacement 2>/dev/null || true
-
-          # Escape XML-sensitive characters from the release body.
-          changelog="${CHANGELOG:-}"
-          changelog="${changelog//&/&amp;}"
-          changelog="${changelog//</&lt;}"
-          changelog="${changelog//>/&gt;}"
-
-          # Read the full metainfo file, preserving newlines.
-          IFS= read -r -d '' contents < "$xml_file" || true
-
-          # Fail clearly if the generated metainfo file no longer has the expected marker.
-          if [[ "$contents" != *"$placeholder"* ]]; then
-            echo "$placeholder not found in $xml_file"
-            exit 1
-          fi
-
-          # Replace the placeholder with the escaped changelog and write the file back.
-          contents="${contents//$placeholder/$changelog}"
-          printf '%s' "$contents" > "$xml_file"
-
       - name: Update submodule
         if: >-
           steps.check-label.outputs.hasTopic == 'true' &&