test(docs-infra): update `http` test to use correct charset name due to chromium update (#43431)
test(docs-infra): update `http` test to use correct charset name due to chromium update (#43431)

We updated the dev-infra version as part of the v13 package format
in order to be able to use the latest `rollup` version (and its
plugins). The update of the shared dev-infra package resulted in an
update of Chromium to a more recent version. This version of Chromium
seems to normalize the `content-type` header differently, so that the
AIO `http` example test assertion needs to be updated to work with the
new version of chromium. This commits updates the test.

PR Close #43431

shairez/angular,brandonroberts/angular,manekinekko/angular,ocombe/angular,brandonroberts/angular,brandonroberts/angular,shairez/angular,gnomeontherun/angular,angular/angular,brandonroberts/angular,ocombe/angular,gkalpak/angular,angular-indonesia/angular,JiaLiPassion/angular,manekinekko/angular,angular-indonesia/angular,angular/angular,JiaLiPassion/angular,gkalpak/angular,angular-indonesia/angular,shairez/angular,angular-indonesia/angular,ocombe/angular,JiaLiPassion/angular,gnomeontherun/angular,JiaLiPassion/angular,brandonroberts/angular,brandonroberts/angular,shairez/angular,gkalpak/angular,angular/angular,manekinekko/angular,manekinekko/angular,ocombe/angular,manekinekko/angular,shairez/angular,angular/angular,ocombe/angular,gkalpak/angular,gnomeontherun/angular,gnomeontherun/angular,manekinekko/angular,ocombe/angular