Fix buggy action sha pin

[ydshieh]

What does this PR do?

I am very disappointed by the 🤖 in #46414.

After that change, we got the following error:

(see this run)
(a run that works with this PR: here)

Error: Missing input! Either a method or webhook is required to take action.
SlackError: Missing input! Either a method or webhook is required to take action.
    at Config.validate (file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/src/config.js:210:1)
    at new Config (file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/src/config.js:126:1)

file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/src/config.js:210
        throw new SlackError(
^
SlackError: Missing input! Either a method or webhook is required to take action.
    at Config.validate (file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/src/config.js:210:1)
    at new Config (file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/src/config.js:126:1)
    at send (file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/src/send.js:12:1)
    at file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/src/index.js:9:1
    at __nccwpck_require__.a (file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/webpack/runtime/async module:49:1)
    at Object.9722 (file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/dist/index.js:47275:21)
    at __nccwpck_require__ (file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/webpack/bootstrap:21:1)
    at file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/webpack/startup:4:1
    at ModuleJob.run (node:internal/modules/esm/module_job:437:25)
    at node:internal/modules/esm/loader:639:26
    at send (file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/src/send.js:12:1)
    at file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/src/index.js:9:1
    at __nccwpck_require__.a (file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/webpack/runtime/async module:49:1)
    at Object.9722 (file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/dist/index.js:47275:21)
    at __nccwpck_require__ (file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/webpack/bootstrap:21:1)
    at file:///__w/_actions/slackapi/slack-github-action/45a88b9581bfab2566dc881e2cd66d334e621e2c/webpack/startup:4:1
    at ModuleJob.run (node:internal/modules/esm/module_job:437:25)
    at node:internal/modules/esm/loader:639:26
Error: Error: failed to run script step: command terminated with non-zero exit code: error executing command [sh -e /__w/_temp/fac99330-64a2-11f1-9510-a1f9b93a9593.sh], exit code 1
Error: Process completed with exit code 1.
Error: Executing the custom container implementation failed. Please contact your self hosted runner administrator.

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