Have a look at the following commit to see when the move from DWARF 4 to 5 first happened upstream:

llvm@d3b26de?diff=unified

Actions triggered by pull_request_target events have access to all
repository secrets, so it is unsafe to use them when executing
untrusted code.  The pr-code-format workflow does not execute
any untrusted code, but it passes untrused input into clang-format.
An attacker could use this to exploit a flaw in clang-format and
potentially gain access to the repository secrets.

By splitting the workflow, we can use the pull_request target which
is more secure and isolate the issue write permissions in a separate
job.  The pull_request target also makes it easier to test changes
to the code-format-helepr.py script, because the version of the
script from the pull request will be used rather than the
version of the script from main.

This reverts commit 42cd33d8d0efb236cc81f94f48d57efb0e1fca19.

This reverts commit 097d2f5.