Bump Rubilmax/foundry-gas-diff from 3.18 to 3.20

Bumps [Rubilmax/foundry-gas-diff](https://github.com/rubilmax/foundry-gas-diff) from 3.18 to 3.20.
- [Release notes](https://github.com/rubilmax/foundry-gas-diff/releases)
- [Commits](Rubilmax/foundry-gas-diff@v3.18...v3.20)

---
updated-dependencies:
- dependency-name: Rubilmax/foundry-gas-diff
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/gas-report.yml

@@ -41,7 +41,7 @@ jobs:
 
       # https://github.com/Rubilmax/foundry-gas-diff
       - name: Compare gas reports
-        uses: Rubilmax/foundry-gas-diff@v3.18
+        uses: Rubilmax/foundry-gas-diff@v3.20
         with:
           summaryQuantile: 0.8 # only display the 20% most significant gas diffs in the summary
           sortCriteria: avg,max # sort diff rows by criteria