Add additional mocks needed for tests in new versions of @actions

[swenson]

Tests started failing after actions was bumped in
#334

[swenson]

Test run:

$ npm run test                                                                                              (git)-[fix-tests-mocks]-

> vault-action@0.1.0 test
> jest

 PASS  src/action.test.js
 PASS  src/auth.test.js

Test Suites: 2 passed, 2 total
Tests:       25 passed, 25 total
Snapshots:   0 total
Time:        0.373 s, estimated 1 s
Ran all test suites.
[swenson@hashicorp 14:11:41] vault-action :) $ npm run test:integration:basic                                                                            (git)-[fix-tests-mocks]-

> vault-action@0.1.0 test:integration:basic
> jest -c integrationTests/basic/jest.config.js

 PASS  integrationTests/basic/integration.test.js
  integration
    ✓ prints a nice error message when secret not found (18 ms)
    ✓ get simple secret (5 ms)
    ✓ re-map secret (5 ms)
    ✓ get nested secret (4 ms)
    ✓ get multiple secrets (6 ms)
    ✓ leading slash kvv2 (3 ms)
    ✓ get secret from K/V v1 (3 ms)
    ✓ get nested secret from K/V v1 (3 ms)
    ✓ leading slash kvv1 (4 ms)
    generic engines
      ✓ supports cubbyhole (4 ms)
      ✓ caches responses (4 ms)

 PASS  integrationTests/basic/jwt_auth.test.js
  jwt auth
    authenticate with private key
      ✓ successfully authenticates (935 ms)
    authenticate with Github OIDC
      ✓ successfully authenticates (6 ms)
      ✓ successfully authenticates with `jwtGithubAudience` set to `sigstore` (917 ms)
      ✓ successfully authenticates as default role without specifying it (5 ms)

Test Suites: 2 passed, 2 total
Tests:       15 passed, 15 total
Snapshots:   0 total
Time:        3.484 s, estimated 4 s
Ran all test suites.

[swenson]

Thanks!