release the 3.9 docs (#415)

Author: bubriks

.github/workflows/mkdocs-release.yml

@@ -29,4 +29,4 @@ jobs:
           git config --global user.email mike@docs.hopsworks.ai
 
       - name: mike deploy docs
-        run: mike deploy 3.8 latest -u --push
+        run: mike deploy 3.9 latest -u --push

mkdocs.yml

@@ -278,7 +278,7 @@ nav:
       - Audit:
           - Access Audit Logs: admin/audit/audit-logs.md
           - Export Audit Logs: admin/audit/export-audit-logs.md
-  - <div class="dropdown"><button class="dropbtn"> API </button> <div id="myDropdown" class="dropdown-content"> <a id="hopsworks_api_link" href="https://docs.hopsworks.ai/hopsworks-api/3.8">Hopsworks API</a> <a id="hsfs_api_link" href="https://docs.hopsworks.ai/feature-store-api/3.8">Feature Store API</a> <a id="hsfs_javadoc_link" href="https://docs.hopsworks.ai/feature-store-api/3.8/javadoc">Feature Store JavaDoc</a> <a id="hsml_api_link" href="https://docs.hopsworks.ai/machine-learning-api/3.8">MLOps API</a> </div></div>: https://docs.hopsworks.ai
+  - <div class="dropdown"><button class="dropbtn"> API </button> <div id="myDropdown" class="dropdown-content"> <a id="hopsworks_api_link" href="https://docs.hopsworks.ai/hopsworks-api/3.9">Hopsworks API</a> <a id="hsfs_api_link" href="https://docs.hopsworks.ai/feature-store-api/3.9">Feature Store API</a> <a id="hsfs_javadoc_link" href="https://docs.hopsworks.ai/feature-store-api/3.9/javadoc">Feature Store JavaDoc</a> <a id="hsml_api_link" href="https://docs.hopsworks.ai/machine-learning-api/3.9">MLOps API</a> </div></div>: https://docs.hopsworks.ai
   - Community ↗: https://community.hopsworks.ai/
 
 theme:
@@ -301,7 +301,7 @@ theme:
     - navigation.indexes
 
 extra:
-  hopsworks_version: 3.8 
+  hopsworks_version: 3.9
   version:
     provider: mike
     default: latest