Run yaml tests twice daily (#131)

This commit updates the CI yml tests
to run them twice a day.

Author: russcam

.ci/jobs/elastic+elasticsearch-rs+7.8.yml

@@ -11,4 +11,4 @@
           description: The Git branch specifier to build
     triggers:
       - github
-      - timed: '@daily'
+      - timed: 'H */12 * * *'

.ci/jobs/elastic+elasticsearch-rs+7.9.yml

@@ -11,4 +11,4 @@
           description: The Git branch specifier to build
     triggers:
       - github
-      - timed: '@daily'
+      - timed: 'H */12 * * *'

.ci/jobs/elastic+elasticsearch-rs+7.x.yml

@@ -11,4 +11,4 @@
           description: The Git branch specifier to build
     triggers:
       - github
-      - timed: '@daily'
+      - timed: 'H */12 * * *'

.ci/jobs/elastic+elasticsearch-rs+master.yml

@@ -11,4 +11,4 @@
           description: The Git branch specifier to build
     triggers:
       - github
-      - timed: '@daily'
+      - timed: 'H */12 * * *'