Rollup merge of #86359 - fee1-dead:f64-junit-formatter, r=JohnTitor
Rollup merge of #86359 - fee1-dead:f64-junit-formatter, r=JohnTitor

Use as_secs_f64 in JunitFormatter

cc `@andoriyu`

graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust