Bump express from 4.17.1 to 4.17.3

Bumps [express](https://github.com/expressjs/express) from 4.17.1 to 4.17.3.
- [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/4.17.1...4.17.3)

---
updated-dependencies:
- dependency-name: express
  dependency-type: direct:production
...

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

package-lock.json

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       "hasInstallScript": true,
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-        "express": "^4.18.1",
+        "express": "^4.17.3",
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@@ -1286,26 +1285,23 @@
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@@ -1929,21 +1926,17 @@
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@@ -2667,38 +2660,37 @@
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         "etag": "~1.8.1",
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@@ -3020,16 +3012,16 @@
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@@ -7569,19 +7560,6 @@
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-      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ=="
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
     },
     "unset-value": {
       "version": "1.0.0",

package.json

@@ -7,7 +7,7 @@
     "@iarna/toml": "^2.2.3",
     "body-parser": "^1.19.0",
     "ejs": "^3.1.6",
-    "express": "^4.18.1",
+    "express": "^4.17.3",
     "express-rate-limit": "^5.0.0",
     "fa-diagrams": "^1.0.3",
     "mathjax-node": "^2.1.1",