Fix deprecation warning if trailing slash in path is omitted

[realFlowControl]

Fixes #3983 if the trailing slash in path is omitted

[sebastianbergmann]

Can you have a look at the test failures? Thanks!

[realFlowControl]

I am on it. Tricky, because it's working on my local machine ... ;-)

[realFlowControl]

This is a weird problem. There is a file named tests/end-to-end/regression/GitHub/3983.phpt and a directory with tests to this named tests/end-to-end/regression/GitHub/3983/. In my local setup, a call to phpunit tests/end-to-end/regression/GitHub/3983 will use the test files from the directory, but in the pipeline it will try to find a test class 3983 in the file 3983.phpt which does not exist.
I fixed this now by renaming the phpt file, but what would be the desired behavior in this case? Should phpunit use the file or the directory?

[codecov]

Codecov Report

Merging #3984 into 8.5 will decrease coverage by 0.03%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                8.5    #3984      +/-   ##
============================================
- Coverage     84.89%   84.86%   -0.04%     
- Complexity     3919     3920       +1     
============================================
  Files           153      153              
  Lines         10092    10093       +1     
============================================
- Hits           8568     8565       -3     
- Misses         1524     1528       +4

Impacted Files	Coverage Δ	Complexity Δ
src/TextUI/Command.php	76.24% <100%> (+0.03%)	218 <0> (+1)	⬆️
src/Util/PHP/AbstractPhpProcess.php	71.97% <0%> (-2.55%)	43% <0%> (ø)

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[sebastianbergmann]

Weird indeed, but (hopefully) a problem for another day.