v1.20.1: Add release notes

[maelvls]

Preview: https://deploy-preview-2029--cert-manager.netlify.app/docs/releases/release-notes/release-notes-1.20

Generated using:

export RELEASE_VERSION="v1.20.1"
export START_TAG="v1.20.0"
export END_REV="release-1.20"
export BRANCH="release-1.20"
# Must be run from the cert-manager folder.
export GITHUB_TOKEN=$(gh auth token)
git fetch origin $BRANCH
export START_SHA="$(git rev-list --reverse --ancestry-path $(git merge-base $START_TAG $BRANCH)..$BRANCH | head -1)"
release-notes --debug --repo-path cert-manager \
 --org cert-manager --repo cert-manager \
 --required-author "cert-manager-prow[bot]" \
 --markdown-links=true \
 --dependencies=false \
 --output website-release-notes.md

[netlify]

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🔍 Latest deploy log	https://app.netlify.com/projects/cert-manager/deploys/69c6da2c7a49fd00089259e7
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[Copilot]

Pull request overview

Adds patch release notes for cert-manager v1.20.1 to the 1.20 release notes page.

Changes:

• Add a new ## v1.20.1 section with three bug/regression entries.
• Reflow the “Be sure to review…” paragraph to wrap across two lines.
• Remove the short introductory sentence about cert-manager (not directly related to adding v1.20.1 notes).

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[erikgb]

/lgtm
/approve

[cert-manager-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: erikgb

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Details

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• OWNERS [erikgb]

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