Replace workflow add-path commands with echo to env file

.github/workflows/codeql-analysis.yml

@@ -39,7 +39,7 @@ jobs:
       run:
         |
         mkdir -p ~/.local/bin
-        echo "::add-path::~/.local/bin"
+        echo "~/.local/bin" >> $GITHUB_PATH
         curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | BINDIR=~/.local/bin sh
 
     - name: Install platform

.github/workflows/main.yml

@@ -41,7 +41,7 @@ jobs:
         run:
           |
           mkdir -p ~/.local/bin
-          echo "::add-path::~/.local/bin"
+          echo "~/.local/bin" >> $GITHUB_PATH
           curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | BINDIR=~/.local/bin sh
 
       - name: Get platform name
@@ -90,7 +90,7 @@ jobs:
             sudo apt-get install -y python3 python3-pip python3-setuptools
             pip3 install wheel
             pip3 install --user adafruit-nrfutil
-            echo "::add-path::/home/runner/.local/bin"
+            echo "/home/runner/.local/bin" >> $GITHUB_PATH
             echo "::set-output name=options:::softdevice=s132v6,debug=l0"
             echo "::set-output name=index-url::--additional-urls https://www.adafruit.com/package_adafruit_index.json"