Update go-text/render to avoid crashing when rendering certain bitmap fonts

[dweymouth]

Checklist

• I have searched the issue tracker for open issues that relate to the same problem, before opening a new one.
• This issue only relates to a single bug. I will open new issues for any other problems.

Describe the bug

There was an index-out-of-bounds fix merged to go-text/render that has not yet been pulled into Fyne

How to reproduce

Load a Fyne app that renders Japanese characters on bare-bones Gentoo linux installation (without extra Japanese font packages installed) - that is at least one scenario in which this comes up

Screenshots

No response

Example code

n/a

Fyne version

release/v2.5.x

Go compiler version

n/a

Operating system and version

Gentoo linux

Additional Information

No response

[andydotxyz]

Given it was just a version bump I pushed the change onto release branch