We use the Confluence Server version LTS 7.13.2 and Apache Tomcat version 9.0.45 is installed here. Our security department would like at least version 9.0.54
Atlassian application installers are bundled with specific version of apache tomcat, so it's not recommended to upgrade apache tomcat to some version which is not supported. Upgrading apache tomcat will lead to an unsupported version and Atlassian wont be able to support in case of any issues.
So official Supported Platform doc says apache tomcat 9.0.45 is supported for 7.13.2 version.
Good news is confluence 7.14.1+ versions and 7.15 support apache tomcat 9.0.54 as mentioned in this URL https://confluence.atlassian.com/conf713/bundled-tomcat-and-java-versions-1077914840.html
Hope this helps !!
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