GH Actions: version update for ramsey/composer-install

The action used to install Composer packages and handle the caching has released a new major (and some follow-up patch releases), which means, the action reference needs to be updated to benefit from it.

Refs:
* https://github.com/ramsey/composer-install/releases/tag/2.0.0
* https://github.com/ramsey/composer-install/releases/tag/2.0.1
* https://github.com/ramsey/composer-install/releases/tag/2.0.2

Author: jrfnl

.github/workflows/push.yml

@@ -48,7 +48,7 @@ jobs:
         run: phive --no-progress install --copy --trust-gpg-keys ${{ env.phiveGPGKeys }} --force-accept-unsigned
 
       - name: Install Composer dependencies & cache dependencies
-        uses: "ramsey/composer-install@v1"
+        uses: "ramsey/composer-install@v2"
         with:
           composer-options: --optimize-autoloader
 
@@ -110,7 +110,7 @@ jobs:
         run: phive --no-progress install --copy --trust-gpg-keys ${{ env.phiveGPGKeys }} phpunit:^8.5
 
       - name: Install Composer dependencies & cache dependencies
-        uses: "ramsey/composer-install@v1"
+        uses: "ramsey/composer-install@v2"
         with:
           composer-options: --optimize-autoloader
 
@@ -200,7 +200,7 @@ jobs:
           ini-values: memory_limit=2G, display_errors=On, error_reporting=-1
 
       - name: Install Composer dependencies & cache dependencies
-        uses: "ramsey/composer-install@v1"
+        uses: "ramsey/composer-install@v2"
         with:
           composer-options: --optimize-autoloader
 
@@ -257,7 +257,7 @@ jobs:
           coverage: none
 
       - name: Install Composer dependencies & cache dependencies
-        uses: "ramsey/composer-install@v1"
+        uses: "ramsey/composer-install@v2"
         with:
           composer-options: --optimize-autoloader