[Backport 2.1] Correctly ignore depandabot branches during push

[opensearch-trigger-bot]

Backport 27c5493 from #4077

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/1378/
• CommitID: c708369

[codecov-commenter]

Codecov Report

Merging #4111 (c708369) into 2.1 (a1206ed) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.1    #4111      +/-   ##
============================================
- Coverage     70.62%   70.61%   -0.02%     
+ Complexity    56397    56367      -30     
============================================
  Files          4515     4515              
  Lines        271419   271419              
  Branches      39958    39958              
============================================
- Hits         191695   191653      -42     
- Misses        63603    63672      +69     
+ Partials      16121    16094      -27     

Impacted Files	Coverage Δ
...opensearch/index/mapper/MockFieldFilterPlugin.java	0.00% <0.00%> (-100.00%)	⬇️
.../java/org/opensearch/node/NodeClosedException.java	50.00% <0.00%> (-50.00%)	⬇️
...ch/transport/ReceiveTimeoutTransportException.java	50.00% <0.00%> (-50.00%)	⬇️
.../java/org/opensearch/search/dfs/AggregatedDfs.java	54.83% <0.00%> (-41.94%)	⬇️
...h/action/ingest/SimulateDocumentVerboseResult.java	60.71% <0.00%> (-39.29%)	⬇️
...ava/org/opensearch/search/dfs/DfsSearchResult.java	43.26% <0.00%> (-35.58%)	⬇️
...nsearch/index/shard/IndexShardClosedException.java	66.66% <0.00%> (-33.34%)	⬇️
...arch/search/aggregations/pipeline/LinearModel.java	23.07% <0.00%> (-30.77%)	⬇️
...a/org/opensearch/index/mapper/MapperException.java	75.00% <0.00%> (-25.00%)	⬇️
...rch/index/cache/bitset/ShardBitsetFilterCache.java	75.00% <0.00%> (-25.00%)	⬇️
... and 445 more

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