9.3-beta2

Changes compared to 9.3-beta1:

Bugfixes:

• Fixes a bug that caused numbers to be stripped when marking a keyphrase containing a number, e.g. Yoast SEO 9.3.
• Fixes the bug where the first H1 of the text would be highlighted as spurious H1 in Gutenberg
• Fixes a bug where the h1 content would also be marked in the text in the single H1 header assessment.