feat(QTimelineEntry): comply with WCAG AA standard for the subtitle quasarframework#11895

Author: rstoenescu

ui/src/components/timeline/QTimeline.sass

@@ -20,7 +20,7 @@
   &__subtitle
     font-size: 12px
     margin-bottom: 8px
-    opacity: .4
+    opacity: .6
     text-transform: uppercase
     letter-spacing: 1px
     font-weight: 700
@@ -240,4 +240,3 @@
 
       &__subtitle, &__content
         width: 50%
-

ui/src/components/timeline/QTimeline.styl

@@ -20,7 +20,7 @@
   &__subtitle
     font-size: 12px
     margin-bottom: 8px
-    opacity: .4
+    opacity: .6
     text-transform: uppercase
     letter-spacing: 1px
     font-weight: 700
@@ -240,4 +240,3 @@
 
       &__subtitle, &__content
         width: 50%
-