Update theme version from 1.15.1 to 1.15.2

Author: ruibaby

theme.yaml

@@ -18,7 +18,7 @@ spec:
   issues: https://github.com/halo-dev/theme-earth/issues
   settingName: "theme-earth-setting"
   configMapName: "theme-earth-configMap"
-  version: 1.15.1
+  version: 1.15.2
   requires: ">=2.22.0"
   license:
     - name: "GPL-3.0"