Update archiver from v5 to v7

I am investigating a Jest test that verifies createStaticPackage creates
a deterministic hash when the file contents do not change, and it seems
to be flaky. I suspect that it might be using a timestamp in the hash
creation which would be a real issue we want to fix, but in the meantime
I figured we might as well update this package to the latest version.

They don't keep a useful changelog, but from what I can tell the
breaking changes only drop support for old node versions that we do not
support.

v6: archiverjs/node-archiver@5.3.2...6.0.0
v7: archiverjs/node-archiver@6.0.2...7.0.0

package.json

@@ -59,7 +59,7 @@
   "dependencies": {
     "@babel/preset-react": "^7.12.1",
     "abort-controller": "^3.0.0",
-    "archiver": "^5.0.2",
+    "archiver": "^7.0.1",
     "async-retry": "^1.3.1",
     "babel-plugin-dynamic-import-node": "^2.1.0",
     "commander": "^2.15.1",