Use more specific self-hosted runner name (#7399)

Co-authored-by: otelbot <[email protected]>

Author: opentelemetrybot

.github/workflows/benchmark-tags.yml

@@ -11,7 +11,7 @@ jobs:
     permissions:
       contents: write # for git push to benchmarks branch
     name: Benchmark SDK
-    runs-on: self-hosted
+    runs-on: github-benchmark-runner
     timeout-minutes: 10
     strategy:
       fail-fast: false

.github/workflows/benchmark.yml

@@ -13,7 +13,7 @@ jobs:
     permissions:
       contents: write # for git push to benchmarks branch
     name: Benchmark SDK
-    runs-on: self-hosted
+    runs-on: github-benchmark-runner
     timeout-minutes: 10
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2