Bump benchmark-action/github-action-benchmark from 1.20.4 to 1.20.5 (open-telemetry#3623)

Author: dependabot[bot]

.github/workflows/benchmark.yml

@@ -69,7 +69,7 @@ jobs:
         run: |
           cat benchmarks/*
       - name: Push benchmark result
-        uses: benchmark-action/github-action-benchmark@d48d326b4ca9ba73ca0cd0d59f108f9e02a381c7 # v1.20.4
+        uses: benchmark-action/github-action-benchmark@4e0b38bc48375986542b13c0d8976b7b80c60c00 # v1.20.5
         with:
           name: OpenTelemetry-cpp ${{ matrix.components }} Benchmark
           tool: 'googlecpp'