Remove jdk14 from pr test pipeline (#1993)
Remove jdk14 from pr test pipeline (#1993)

JDK14 is done and dusted, so we gain nothing from testing on it.

Signed-off-by: Adam Farley <f73ed74b0b47107ddcc7b19cba7a19d91d4c7819@uk.ibm.com>
AdoptOpenJDK/openjdk-build,AdoptOpenJDK/openjdk-build,karianna/openjdk-build,karianna/openjdk-build