fix(plugins): create directory before uploading

[thalesmg]

Fixes https://emqx.atlassian.net/browse/EMQX-9434

Fixes emqx/emqx-elixir-plugin#23

PR Checklist

Please convert it to a draft if any of the following conditions are not met. Reviewers may skip over until all the items are checked:

• Added tests for the changes
• Changed lines covered in coverage report
• Change log has been added to changes/{ce,ee}/(feat|perf|fix)-<PR-id>.en.md files
• For internal contributor: there is a jira ticket to track this change
• If there should be document changes, a PR to emqx-docs.git is sent, or a jira ticket is created to follow up
• Schema changes are backward compatible

Checklist for CI (.github/workflows) changes

• If changed package build workflow, pass this action (manual trigger)
• Change log has been added to changes/ dir for user-facing artifacts update

[coveralls]

Pull Request Test Coverage Report for Build 4568886047

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 41 unchanged lines in 15 files lost coverage.
• Overall coverage increased (+0.007%) to 81.064%

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Files with Coverage Reduction	New Missed Lines	%
apps/emqx_bridge/src/emqx_bridge.erl	1	91.2%
apps/emqx_gateway/src/mqttsn/emqx_sn_channel.erl	1	73.13%
apps/emqx_modules/src/emqx_delayed.erl	1	94.78%
apps/emqx/src/emqx_flapping.erl	1	85.11%
apps/emqx/src/emqx_logger.erl	1	80.49%
apps/emqx/src/emqx_router_helper.erl	1	86.27%
apps/emqx/src/emqx_session.erl	1	87.65%
apps/emqx_connector/src/emqx_connector_jwt_worker.erl	2	92.54%
apps/emqx_resource/src/emqx_resource_buffer_worker_sup.erl	2	86.96%
apps/emqx/src/emqx_banned.erl	2	89.39%

Totals
Change from base Build 4566317424:	0.007%
Covered Lines:	25040
Relevant Lines:	30889

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💛 - Coveralls