Bump express from 4.16.3 to 4.18.2 in /gas-relayer

Bumps [express](https://github.com/expressjs/express) from 4.16.3 to 4.18.2.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](https://github.com/expressjs/express/compare/4.16.3...4.18.2)

---
updated-dependencies:
- dependency-name: express
  dependency-type: indirect
...

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

gas-relayer/package-lock.json

@@ -126,15 +126,6 @@
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@@ -319,7 +310,7 @@
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-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
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+      "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.2.tgz",
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@@ -1115,21 +1115,11 @@
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@@ -1378,11 +1368,6 @@
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@@ -1849,112 +1834,276 @@
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+      "version": "4.18.2",
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+        "cookie": "0.5.0",
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-        "finalhandler": "1.1.1",
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