fix: load bitmap font fail in browser

[xdoer]

Jimp supports loading fonts from URLs, but on the browser, I found that it performs abnormally under non localhost domains.

Then I found that there was a problem with the following line of code,

jimp/plugins/plugin-print/src/load-bitmap-font.ts

Line 161 in b6b0e41

CharacterJimp.read(path.join(path.dirname(file), page))

and it will eventually construct a similar one https:/raw.githubusercontent.com/jimp-dev/jimp/main/plugins/plugin-print/fonts/open-sans/open-sans-16-black/open-sans-16-black.png

The link clearly shows that there is a missing '/' after 'https'.

[xdoer]

I found it is interesting, I used the following code to test it separately in Node environment, browser environment under localhost URL, and https URL.

fetch("https:/raw.githubusercontent.com/jimp-dev/jimp/main/plugins/plugin-print/fonts/open-sans/open-sans-16-black/open-sans-16-black.png")

It can take effect in both Node environment and browser localhost address.
But it does not take effect in HTTPS address.