build: marking dependencies (8) non-required (#1472) (#1035)

Co-authored-by: Anthonios Partheniou <[email protected]>
Source-Link: googleapis/synthtool@72c64b7
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:b2e8f445ca0e605d4bbefbfdbdf7335692d75cf1647af62243828dcc0ea4e690

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-java:latest
-  digest: sha256:d4b80feffe1579818cdc39466152e9de95789a193408506cd4a1ffbe8804dc00
-# created: 2022-07-13T13:53:17.676447481Z
+  digest: sha256:b2e8f445ca0e605d4bbefbfdbdf7335692d75cf1647af62243828dcc0ea4e690
+# created: 2022-07-14T21:08:10.768472192Z