Move away from set-output (while updating all deps) (#148)

* Update all our deps

Get rid of warnings such as:
* `save-state` will be deprecated
* `set-output` will be deprecated
* nodejs 12 is being deprecated
...

Rely on tests to make sure the actions still works

* Fix as per CI results

* Get rid of deprecated containers

* Have a warningless run

We're not testing rebar3 here, in any case

package.json

@@ -19,23 +19,23 @@
     }
   },
   "dependencies": {
-    "@actions/core": "1.9.1",
+    "@actions/core": "1.10.0",
     "@actions/exec": "1.1.1",
-    "semver": "7.3.6"
+    "semver": "7.3.8"
   },
   "devDependencies": {
-    "@vercel/ncc": "0.33.4",
-    "eslint": "8.14.0",
+    "@vercel/ncc": "0.34.0",
+    "eslint": "8.25.0",
     "eslint-config-airbnb": "19.0.4",
     "eslint-plugin-import": "2.26.0",
-    "eslint-plugin-jsx-a11y": "6.5.1",
-    "eslint-plugin-react": "7.29.0",
-    "husky": "7.0.4",
-    "markdownlint": "0.25.1",
-    "prettier": "2.6.2",
+    "eslint-plugin-jsx-a11y": "6.6.1",
+    "eslint-plugin-react": "7.31.10",
+    "husky": "8.0.1",
+    "markdownlint": "0.26.2",
+    "prettier": "2.7.1",
     "shellcheck": "1.1.0",
-    "yaml-lint": "1.3.0",
-    "yarn": "1.22.18"
+    "yaml-lint": "1.7.0",
+    "yarn": "1.22.19"
   },
   "engines": {
     "node": ">=16"