Bump myclabs/deep-copy from 1.9.5 to 1.10.0

Bumps [myclabs/deep-copy](https://github.com/myclabs/DeepCopy) from 1.9.5 to 1.10.0.
- [Release notes](https://github.com/myclabs/DeepCopy/releases)
- [Commits](https://github.com/myclabs/DeepCopy/compare/1.9.5...1.10.0)

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -57,7 +57,7 @@
         "symfony/yaml": "4.4.10",
         "symfony/finder": "3.4.8",
         "symfony/stopwatch" : "4.4.10",
-        "myclabs/deep-copy": "1.9.5",
+        "myclabs/deep-copy": "1.10.0",
         "phpunit/phpunit" : "^7",
         "phpunit/phpunit-selenium": "^7",
         "roave/security-advisories": "dev-master"