Update APT and brew metadata before installing additional libraries

Author: pzygielo

.github/workflows/maven.yml

@@ -76,10 +76,10 @@ jobs:
       uses: actions/checkout@v2
     - name: Install required libraries (ubuntu)
       if: ${{ matrix.os == 'ubuntu-latest' }}
-      run: sudo apt-get install -y libnspr4-dev libnss3-dev
+      run: sudo apt-get update && sudo apt-get install -y libnspr4-dev libnss3-dev
     - name: Install required libraries (macos)
       if: ${{ matrix.os == 'macos-latest' }}
-      run: brew install nspr nss
+      run: brew update && brew install nspr nss
     - name: Build mqcrt library (ubuntu)
       if: ${{ matrix.os == 'ubuntu-latest' }}
       run: |