chore(java): manually exclude requirements.txt from renovate bot (#860)

Manually brings in changes from https://togithub.com/googleapis/synthtool/pull/1594. [Renovate.json is excluded in owlbot](https://togithub.com/googleapis/java-shared-dependencies/blob/675837378642f39fe55c0e30b62755b9185bee3d/owlbot.py#L22) so the changes in synthtool couldn't be applied. This is to stop update dep PRs like [this one](https://togithub.com/googleapis/java-shared-dependencies/pull/859) from showing up in the repo.
googleapis · Oct 10, 2022 · 0220cda · 0220cda
1 parent 6758373
commit 0220cda
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/java-shared-dependencies/renovate.json b/java-shared-dependencies/renovate.json
@@ -10,6 +10,7 @@
     ":maintainLockFilesDisabled",
     ":autodetectPinVersions"
   ],
+  "ignorePaths": [".kokoro/requirements.txt"],
   "packageRules": [
     {
       "packagePatterns": [
@@ -60,4 +61,4 @@
   ],
   "semanticCommits": true,
   "masterIssue": true
-}
+}