Update nimtest.yml to use sudo for pcre3 install

.github/workflows/nimtest.yml

@@ -21,7 +21,7 @@ jobs:
     - uses: actions/checkout@v3
     - name: Install PCRE3
       run: |
-        apt -y update && apt install -y libpcre3
+        sudo apt-get install -y libpcre3
     - name: Set up Nim
       run: |
         curl https://nim-lang.org/choosenim/init.sh -sSf > init.sh