github-actions: fix typo in win32 + update repos in linux before installing

Author: alberthdev

.github/workflows/build.linux.workflow.yml

@@ -27,6 +27,7 @@ jobs:
     - name: Install Linux dependencies (Ubuntu 18.04+)
       run: |
         set -e
+        sudo apt-get update
         sudo apt-get install qt5-default qtbase5-dev libgl1-mesa-dev libarchive-dev libsdl2-dev libusb-1.0-0-dev
 
     - name: Build CEmu on Linux

.github/workflows/build.msvc.windows.workflow.yml

@@ -89,7 +89,7 @@ jobs:
     - name: "Set shared/dynamic Qt location (v${{ env.QT_VERSION }}, ${{ matrix.arch_name }})"
       if: ${{ matrix.linking == 'dynamic' }}
       run: |
-        echo QT5_BIN_DIR::${{ env.Qt5_DIR }}/bin >> %GITHUB_ENV%
+        echo QT5_BIN_DIR=${{ env.Qt5_DIR }}/bin >> %GITHUB_ENV%
 
     # Add MSYS2's /usr/bin to the PATH.
     # This allows vcpkg's build of libpng[apng] to succeed with adding the library prefix.