Bump runner from 1.3.0 to 1.4.0 (#2563)

Summary:
Bumps runner from 1.3.0 to 1.4.0.

[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=androidx.test:runner&package-manager=gradle&previous-version=1.3.0&new-version=1.4.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

 ---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `dependabot rebase` will rebase this PR
- `dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `dependabot merge` will merge this PR after your CI passes on it
- `dependabot squash and merge` will squash and merge this PR after your CI passes on it
- `dependabot cancel merge` will cancel a previously requested merge and block automerging
- `dependabot reopen` will reopen this PR if it is closed
- `dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
- `dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
- `dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
- `dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

</details>

Pull Request resolved: https://github.com/facebook/flipper/pull/2563

Reviewed By: muraziz

Differential Revision: D29992992

Pulled By: passy

fbshipit-source-id: 4e72fc3a21fead198b1842269116d0e1e8348359

build.gradle

@@ -62,7 +62,7 @@ ext.deps = [
         supportSqlite      : "androidx.sqlite:sqlite-framework:2.1.0",
         supportEspresso    : 'androidx.test.espresso:espresso-core:3.4.0',
         supportEspressoIntents : 'androidx.test.espresso:espresso-intents:3.4.0',
-        supportTestRunner  : 'androidx.test:runner:1.3.0',
+        supportTestRunner  : 'androidx.test:runner:1.4.0',
         // Arch
         archPaging         : 'android.arch.paging:runtime:1.0.1',
         // First-party