upgrade to parcel-bundler^1.12.5 from parcel^1.12.3 in templates

[Catminusminus]

This will fix #980.

Currently, in the two template projects (react and react-with-storybook), you will encounter "Invalid Version: undefined" errors when you type yarn start in the example directories.

This is due to specifying "parcel": "^1.12.3" in package.json and upgrading to 1.12.5 will fix the problem.

However, v1.12.5 exists only in parcel-bundler package, so I change "parcel": "^1.12.3" to "parcel-bundler": "^1.12.5".

In addition, upgrading to parcel v2 beta will break hot module reloading (#980 (comment)), so I decided to use not parcel v2 but parcel-bundler.

[carlostorreswav]

This fixes the issue

[thebiltheory]

@Catminusminus something seems to be wrong with the checks.
Anything we can do to unlock these?

[binvb]

same error, this commit works for me

[Catminusminus]

I got the three approvements, so I will explain this situation.

Let me get straight to the point, this project seems to be "dead".
See #1058 for detail.
And only you can do Is fork thIs project (or use a forked project like this).

To unlock CI for this PR, an approvement by a reviewer with write access permission is required.
And this seems to be impossible now.

[sidwebworks]

Just tried adding parcel bundler with the given version @Catminusminus

Although I can now see this console error,

parcelRequire is not defined

Any ideas what this could be?

[sidwebworks]