Update yoast/wordpress-seo requirement from ^17.9 to ^20.1

[dependabot[bot]]

Updates the requirements on yoast/wordpress-seo to permit the latest version.

Commits

• 9ec5a7a Release 20.1
• 621629d Release 20.1-RC7
• cd016da Release 20.1-RC6
• 3a84d1b Release 20.1-RC5
• 50b1802 Release 20.1-RC4
• ebe73a0 Release 20.1-RC3
• 7014ef6 Release 20.1-RC2
• 45e83e4 Release 20.0.1-RC1
• e1dc38e Release 20.1-RC1
• ad916a0 Release 20.0
• Additional commits viewable in compare view

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[mikelittle]

@dependabot ignore this minor version

[dependabot[bot]]

OK, I won't notify you about version 20.1.x again, unless you re-open this PR. 😢