Bump themes/projektemacher-base from `a89c47b` to `20b5c17`

[dependabot[bot]]

Bumps themes/projektemacher-base from a89c47b to 20b5c17.

Commits

• 20b5c17 Merge pull request #268 from cmahnke/dependabot/npm_and_yarn/npm-a91df62bea
• 72d7a9b Bump three from 0.163.0 to 0.164.1 in the npm group
• 7b801fb Merge pull request #267 from cmahnke/dependabot/npm_and_yarn/npm-9e4c86b6ad
• f20c302 Bump postcss-discard-duplicates from 6.0.3 to 7.0.0 in the npm group
• See full diff in compare view

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[dependabot[bot]]

Superseded by #165.