update phpspec/prophecy to 1.20 for 10.x

Closes #3488401

added 2 commits

• e2a92ae2 - 1 commit from branch project:10.5.x
• 5065fab6 - update phpspec/prophecy to 1.20 for 10.x

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added 9 commits

• 5065fab6...a68df986 - 8 commits from branch project:10.5.x
• 332dfd0a - update phpspec/prophecy to 1.20 for 10.x

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closed