Infra: FE: Bump pnpm to 9.15.4 (#776)

Author: yeikel

.github/workflows/frontend_tests.yml

@@ -23,7 +23,7 @@ jobs:
 
       - uses: pnpm/action-setup@v4.0.0
         with:
-          version: 9.15.0
+          version: 9.15.4
 
       - name: Install node
         uses: actions/setup-node@v4.0.2

pom.xml

@@ -59,7 +59,7 @@
 
         <!-- Frontend dependency versions -->
         <node.version>v22.12.0</node.version>
-        <pnpm.version>v9.15.0</pnpm.version>
+        <pnpm.version>v9.15.4</pnpm.version>
 
         <!-- Plugin versions -->
         <fabric8-maven-plugin.version>0.45.1</fabric8-maven-plugin.version>