github newrelic/docs-website release-12.13.2021-21.09

🚀 What's new?

@austin-schaefer - chore(networks doc): Clarify what "last updated" means ->
@austin-schaefer - chore(networks): Cross-ref NPM doc ->
@barbnewrelic - Update security-bulletin-nr21-03.mdx ->
@barbnewrelic - Update new-relic-security.yml ->
@barbnewrelic - Update security-bulletin-nr21-03.mdx ->
@barbnewrelic - Update security-bulletin-nr21-03.mdx ->
@barbnewrelic - feat(NR21-04): Added new bulletin and updated the related bulletins accordingly ->
@barbnewrelic - chore(snyk): not sure what snyk is ->
@barbnewrelic - chore(CVE-2021-44228): needed a dash between CVE and 2021 ->
@barbnewrelic - Merge pull request #5284 from newrelic/log4j-1203-update ->
@austin-schaefer - Merge pull request #5274 from newrelic/austin-schaefer-patch-3 ->

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