gitlab-ci.yml: switch to default.xml manifest

The develop.xml manifest file was recently removed, switch to
default.xml which takes its place.

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>

.gitlab-ci.yml

@@ -31,7 +31,7 @@ reuse:
   variables:
     OHOS_MANIFEST_URL: https://git.ostc-eu.org/OSTC/OHOS/manifest
     OHOS_MANIFEST_BRANCH: develop
-    OHOS_MANIFEST_NAME: develop.xml
+    OHOS_MANIFEST_NAME: default.xml
     OHOS_GIT_REPO_PATH: docs
   before_script: &doc-workspace-before
     - test ! -e "$CI_PROJECT_DIR"/.scratch-dir-name || (