[PROJ] github backporting application

[Even Rouault]

Hi,

I've just seen that QGIS has started using a github backporting application,
https://github.com/apps/backporting, and I've just setup it for GDAL and PROJ

So the workflow is :
1) Create a pull request against master
2) If backport is needed, label it with "backport {branchname}" (I've created 
a "backport release/2.4" for GDAL and "backport 6.0" for PROJ)
3) Merge the pull request
4) The backport application automatically creates a new pull request against 
the target backport branch, and cherry-picks all the commits of the original 
pull request
5) Wait for CI to complete (or not) and merge (or not) this new PR

Of course this doesn't solve automagically conflicts etc, but can be 
convenient for trivial backports when branches are close enough

Even

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