github-actions(deps): bump shivammathur/setup-php from 2.7.0 to 2.8.0

Bumps [shivammathur/setup-php](https://github.com/shivammathur/setup-php) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/shivammathur/setup-php/releases)
- [Commits](shivammathur/setup-php@2.7.0...a67fcb9)

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/continuous-integration.yml

@@ -26,7 +26,7 @@ jobs:
         uses: "actions/checkout@v2.3.4"
 
       - name: "Install PHP"
-        uses: "shivammathur/setup-php@2.7.0"
+        uses: "shivammathur/setup-php@2.8.0"
         with:
           php-version: "${{ matrix.php-versions }}"
           extensions: "mbstring"
@@ -66,7 +66,7 @@ jobs:
         uses: "actions/checkout@v2.3.4"
 
       - name: "Install PHP"
-        uses: "shivammathur/setup-php@2.7.0"
+        uses: "shivammathur/setup-php@2.8.0"
         with:
           php-version: "${{ matrix.php-versions }}"
           extensions: "mbstring"
@@ -111,7 +111,7 @@ jobs:
         uses: "actions/checkout@v2.3.4"
 
       - name: "Install PHP"
-        uses: "shivammathur/setup-php@2.7.0"
+        uses: "shivammathur/setup-php@2.8.0"
         with:
           php-version: "${{ matrix.php-versions }}"
           extensions: "mbstring"
@@ -159,7 +159,7 @@ jobs:
         uses: "actions/checkout@v2.3.4"
 
       - name: "Install PHP"
-        uses: "shivammathur/setup-php@2.7.0"
+        uses: "shivammathur/setup-php@2.8.0"
         with:
           php-version: "${{ matrix.php-versions }}"
           extensions: "mbstring"
@@ -209,7 +209,7 @@ jobs:
         uses: "actions/checkout@v2.3.4"
 
       - name: "Install PHP"
-        uses: "shivammathur/setup-php@2.7.0"
+        uses: "shivammathur/setup-php@2.8.0"
         with:
           php-version: "${{ matrix.php-versions }}"
           extensions: "mbstring"
@@ -254,7 +254,7 @@ jobs:
         uses: "actions/checkout@v2.3.4"
 
       - name: "Install PHP"
-        uses: "shivammathur/setup-php@2.7.0"
+        uses: "shivammathur/setup-php@2.8.0"
         with:
           php-version: "${{ matrix.php-versions }}"
           extensions: "mbstring"