Curl not available in Jekyll image, replaced by wget

bin/gen_versions_yml.sh

@@ -3,7 +3,7 @@
 # Extract Orekit versions from the changes.xml file provided in the Orekit
 # repository and ignore versions prior to 6.1 (they are no longer managed).
 
-curl -sSL https://gitlab.orekit.org/orekit/orekit/-/raw/master/src/changes/changes.xml \
+wget -q -O - https://gitlab.orekit.org/orekit/orekit/-/raw/master/src/changes/changes.xml \
      | xmlstarlet sel -T -t -m '//document/body/release/@version' -v 'concat("- ",.)' -n \
      | grep -vE '^- ([0-5]\.|6\.0)' \
      > _data/orekit/versions.yml
@@ -11,13 +11,13 @@ curl -sSL https://gitlab.orekit.org/orekit/orekit/-/raw/master/src/changes/chang
 # Extract Rugged versions from the changes.xml file provided in the Rugged
 # repository
 
-curl -sSL https://gitlab.orekit.org/orekit/rugged/-/raw/master/src/changes/changes.xml \
+wget -q -O - https://gitlab.orekit.org/orekit/rugged/-/raw/master/src/changes/changes.xml \
      | xmlstarlet sel -T -t -m '//document/body/release/@version' -v 'concat("- ",.)' -n \
      > _data/rugged/versions.yml
 
 # Extract Orekit Tutorials versions from the changes.xml file provided in the
 # Orekit Tutorials repository
 
-curl -sSL https://gitlab.orekit.org/orekit/orekit-tutorials/-/raw/master/src/changes/changes.xml \
+wget -q -O - https://gitlab.orekit.org/orekit/orekit-tutorials/-/raw/master/src/changes/changes.xml \
      | xmlstarlet sel -T -t -m '//document/body/release/@version' -v 'concat("- ",.)' -n \
      > _data/orekit-tutorials/versions.yml