Fix out of date git upstream URLs

Author: hsaunders1904

learners/common-issues.md

@@ -143,7 +143,7 @@ Git Bash uses its own SSH library by default, which may result in errors such as
 even after adding your SSH key correctly:
 
 ```
-$ git clone git@github.com:ukaea-rse-training/python-intermediate-inflammation
+$ git clone git@github.com:carpentries-incubator/python-intermediate-inflammation.git
 Cloning into 'python-intermediate-inflammation'...
 git@github.com: Permission denied (publickey).
 fatal: Could not read from remote repository.

slides/section_4_collaborative_soft_dev.md

@@ -46,7 +46,7 @@ git branch --all
 If not, please run these commands:
 
 ```bash
-git remote add upstream git@github.com:ukaea-rse-training/python-intermediate-inflammation.git
+git remote add upstream git@github.com:carpentries-incubator/python-intermediate-inflammation.git
 git fetch upstream
 git checkout upstream/feature-std-dev
 git switch --create feature-std-dev