[backports-release-1.12] Fix JET warnings in show(::IOBuffer, ::StackFrame)
#60740
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This backports the part of #60645 that is applicable to 1.12. Furthermore, I added a type assertion two lines above the other changes that was taken from #58430. Without this, there are still JET warnings in 1.12 for the above query.
cc @DilumAluthge