Ensure legacy module dependencies are installed

Without an install this build relies on downloading the SNAPSHOT
artifacts for the dependencies. These artifacts may not represent the
latest state of the codebase for those modules.

Author: aherbert

.github/workflows/maven_legacy.yml

@@ -47,5 +47,8 @@ jobs:
         distribution: temurin
         java-version: ${{ matrix.java }}
         cache: 'maven'
+    # Ensure the legacy module dependencies are installed
+    - name: Install dependencies
+      run: mvn -V --no-transfer-progress install -pl commons-math-core,commons-math-legacy-exception,commons-math-legacy-core
     - name: Build with Maven
       run: mvn -V --no-transfer-progress clean test -pl commons-math-legacy