Infinite recursion when "--static-backup --strict-global-state" is used

[5lava]

To reproduce:

mkdir -p foo &&
pushd foo &&
cat <<PHP > SomeTest.php
<?php
class SomeTest extends \PHPUnit\Framework\TestCase {
    public function test_foo(): void { }
    public function test_bar(): void { }
}
PHP
composer require phpunit/phpunit:9.3.11 &&
vendor/bin/phpunit --static-backup --strict-global-state SomeTest.php &&
popd

Result:

PHPUnit 9.3.11 by Sebastian Bergmann and contributors.

RPHP Fatal error:  Nesting level too deep - recursive dependency? in /tmp/foo/vendor/phpunit/phpunit/src/Framework/TestCase.php on line 2369

I git-bisected the origin all the way to 9a7a667.
Sorry, not providing tests for this fix.

[codecov]

Codecov Report

Merging #4470 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #4470   +/-   ##
=========================================
  Coverage     85.23%   85.23%           
  Complexity     4593     4593           
=========================================
  Files           245      245           
  Lines         12591    12592    +1     
=========================================
+ Hits          10732    10733    +1     
  Misses         1859     1859           

Impacted Files	Coverage Δ	Complexity Δ
src/Framework/TestCase.php	89.54% <100.00%> (+0.01%)	326.00 <0.00> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c42c419...43161e6. Read the comment docs.

[sebastianbergmann]

Cherry-picked into 8.5 and merged from there, thanks.