qa: Update workflows - test with Mockery ~1.6.0 (#14)

Author: michalbundyra

.github/workflows/tests.yml

@@ -22,6 +22,7 @@ jobs:
           - '7.1'
           - '7.0'
         mockery-version:
+          - '1.6.0'
           - '1.5.0'
           - '1.4.0'
           - '1.3.0'
@@ -79,20 +80,30 @@ jobs:
             mockery-version: '0.9.0'
           - php-version: '7.4'
             mockery-version: '0.8.0'
-            
+
+          # PHP 7.3 Exclusions
+          - php-version: '7.3'
+            mockery-version: '1.6.0'
+
           # PHP 7.2 Exclusions
+          - php-version: '7.2'
+            mockery-version: '1.6.0'
           - php-version: '7.2'
             mockery-version: '1.5.0'
           - php-version: '7.2'
             mockery-version: '1.4.0'
 
           # PHP 7.1 Exclusions
+          - php-version: '7.1'
+            mockery-version: '1.6.0'
           - php-version: '7.1'
             mockery-version: '1.5.0'
           - php-version: '7.1'
             mockery-version: '1.4.0'
 
           # PHP 7.0 Exclusions
+          - php-version: '7.0'
+            mockery-version: '1.6.0'
           - php-version: '7.0'
             mockery-version: '1.5.0'
           - php-version: '7.0'