chore: update renovate to only update libraries-bom version in `READM…

…E.md` in 4 modules (#10768)

* chore: update renovate to exclude libraries-bom update in README.md

* Revert "chore: update renovate to exclude libraries-bom update in README.md"

This reverts commit eb72ebd.

* only update libraries-bom in 4 modules

renovate.json

@@ -43,7 +43,10 @@
     },
     {
       "fileMatch": [
-        "README.md"
+        "java-dns/README.md",
+        "java-grafeas/README.md",
+        "java-notification/README.md",
+        "java-vertexai/README.md"
       ],
       "matchStrings": [
         "<artifactId>libraries-bom</artifactId>\\s+<version>(?<currentValue>.*?)</version>"