chore: remove java 7 units check (#1168) (#250)

Source-Link: googleapis/synthtool@1a2878d
Post-Processor: gcr.io/repo-automation-bots/owlbot-java:latest@sha256:12cbdc4f137152a1a8b83f50ebc1a4098be0d3baff78b46efaec306f7cfafd13

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -1,3 +1,3 @@
 docker:
   image: gcr.io/repo-automation-bots/owlbot-java:latest
-  digest: sha256:2904b9ad921ecc1343d1cf815bfaafbcc1115c1f39593aef9f8e333ffda552f7
+  digest: sha256:12cbdc4f137152a1a8b83f50ebc1a4098be0d3baff78b46efaec306f7cfafd13

.github/workflows/ci.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [7, 8, 11]
+        java: [8, 11]
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-java@v1