build(deps): bump github.com/prometheus/exporter-toolkit (#8608)

Bumps [github.com/prometheus/exporter-toolkit](https://github.com/prometheus/exporter-toolkit) from 0.19.0 to 0.20.0.
- [Release notes](https://github.com/prometheus/exporter-toolkit/releases)
- [Commits](https://github.com/prometheus/exporter-toolkit/compare/v0.19.0...v0.20.0)

---
updated-dependencies:
- dependency-name: github.com/prometheus/exporter-toolkit
  dependency-version: 0.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.sum

@@ -341,8 +341,8 @@ github.com/prometheus/client_model v0.6.3 h1:O0jaTVAYNxTHYInEPFJt5I3+sN8zqBtVMPT
 github.com/prometheus/client_model v0.6.3/go.mod h1:gpN5P9S7Rr6Yr92PiQ+Ixvhf6JZEkF1dnxsYL2aPBEM=
 github.com/prometheus/common v0.72.0 h1:tAYsE+sPJxIncDAobm4H5aQjmox9ZxEIIqPbiffa8G4=
 github.com/prometheus/common v0.72.0/go.mod h1:77NWqAQ2tXT7BIK40qjJdw5Acrsrg1TlHAnsQi3i6mk=
-github.com/prometheus/exporter-toolkit v0.19.0 h1:JljWCzE5naAiZ7Ukeb8PwjNbU+WwISuW0ktgdXMnMhc=
-github.com/prometheus/exporter-toolkit v0.19.0/go.mod h1:kOoEK/7wbe2Ns33l7wYHOXDZAZ/XGLyJqoGwmJxK+QU=
+github.com/prometheus/exporter-toolkit v0.20.0 h1:hz3g2aPcq3mXlQSt1MGjj2rwVk1wtRalF+/FjYxFRkI=
+github.com/prometheus/exporter-toolkit v0.20.0/go.mod h1:gIIY0Mw0ci1wgYscdeMqVh6FUPYJca549eOkE39nU64=
 github.com/prometheus/procfs v0.21.1 h1:GljZCt+zSTS+NZq88cyQ1LjZ+RCHp3uVuabBWA5+OJI=
 github.com/prometheus/procfs v0.21.1/go.mod h1:aB55Cww9pdSJVHk0hUf0inxWyyjPogFIjmHKYgMKmtY=
 github.com/puzpuzpuz/xsync/v3 v3.5.1 h1:GJYJZwO6IdxN/IKbneznS6yPkVC+c3zyY/j19c++5Fg=