Bump @actions/exec from 1.1.1 to 3.0.0 (#405)

* Bump @actions/exec from 1.1.1 to 3.0.0

Bumps [@actions/exec](https://github.com/actions/toolkit/tree/HEAD/packages/exec) from 1.1.1 to 3.0.0.
- [Changelog](https://github.com/actions/toolkit/blob/main/packages/exec/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/HEAD/packages/exec)

---
updated-dependencies:
- dependency-name: "@actions/exec"
  dependency-version: 3.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

* Modernize JS somewhat

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Paulo F. Oliveira <paulo.ferraz.oliveira@gmail.com>

package.json

@@ -1,5 +1,6 @@
 {
   "name": "setup-beam",
+  "type": "module",
   "license": "MIT",
   "private": true,
   "scripts": {
@@ -17,7 +18,7 @@
   },
   "dependencies": {
     "@actions/core": "1.11.1",
-    "@actions/exec": "1.1.1",
+    "@actions/exec": "3.0.0",
     "@actions/tool-cache": "2.0.2",
     "csv-parse": "6.1.0",
     "lodash": "4.17.23",