fix depreciated command

assets/ourwork-images/convert-ourwork-images.sh

@@ -1,8 +1,8 @@
-#!/usr/bin/env bash
-
-mkdir -p optimised
-for file in original-jpg-converted/*; do
-    echo $file
-    base_name=$(basename $file)
-    convert ${file} -resize "1000x1000>" -quality 89 optimised/${base_name}
-done
+#!/usr/bin/env bash
+
+mkdir -p optimised
+for file in original-jpg-converted/*; do
+    echo $file
+    base_name=$(basename $file)
+    magick ${file} -resize "1000x1000>" -quality 89 optimised/${base_name}
+done