Switch default spring.mvc.pathmatch.matching-strategy

[philwebb]

We could upgrade to the new PathPattern based solution now.

[wilkinsona]

#24874 and #24877 need to be addressed before we can tackle this one.

[philwebb]

Also blocked on spring-projects/spring-framework#26415

[bclozel]

We're also fixing spring-projects/spring-framework#26411 in the upcoming Spring Framework 5.3.4 release.

[philwebb]

See also spring-projects/spring-framework#26445 which should allow us to relax the servlet path check