fix: more retain elan versions (#476)

Author: alissa-tung

config.siyuan.yaml

@@ -484,7 +484,7 @@ repos:
     <<: *oneshot_common
   # elan
   - type: shell_script
-    script: /worker-script/mirror-clone-v2.sh --workers 4 --target-type s3 --s3-prefix elan --s3-buffer-path /var/cache --s3-scan-metadata --print-plan 100 elan --retain-elan-versions 2 --retain-lean-versions 10 --retain-lean-nightly-versions 14 --retain-glean-versions 1
+    script: /worker-script/mirror-clone-v2.sh --workers 4 --target-type s3 --s3-prefix elan --s3-buffer-path /var/cache --s3-scan-metadata --print-plan 100 elan --retain-elan-versions 5 --retain-lean-versions 10 --retain-lean-nightly-versions 14 --retain-glean-versions 1
     serve_mode: mirror_intel
     interval: 7000
     name: elan