[FIX] config: fix release flow

[fw-bot]

Apparentlyn relying on a JSON output was not a good idea and might have been dropepd by github recently (over the last months). This PR fixes the flow by outputting the variables independently without relying on a JSON pack/unpack which is ultimately more efficient.

Task: 0

Description:

description of this task, what is implemented and why it is implemented that way.

Task: TASK_ID

review checklist

• feature is organized in plugin, or UI components
• support of duplicate sheet (deep copy)
• in model/core: ranges are Range object, and can be adapted (adaptRanges)
• in model/UI: ranges are strings (to show the user)
• undo-able commands (uses this.history.update)
• multiuser-able commands (has inverse commands and transformations where needed)
• new/updated/removed commands are documented
• exportable in excel
• translations (_t("qmsdf %s", abc))
• unit tested
• clean commented code
• track breaking changes
• doc is rebuild (npm run doc)
• status is correct in Odoo

Forward-Port-Of: #8190
Forward-Port-Of: #8176

[robodoo]

[fw-bot]

@rrahir @LucasLefevre cherrypicking of pull request #8176 failed.

stdout:

Auto-merging .github/workflows/release.yml
CONFLICT (content): Merge conflict in .github/workflows/release.yml

Either perform the forward-port manually (and push to this branch, proceeding as usual) or close this PR (maybe?).

In the former case, you may want to edit this PR message as well.

⚠️ after resolving this conflict, you will need to merge it via @robodoo.

More info at https://github.com/odoo/odoo/wiki/Mergebot#forward-port