Move back to Adoptium 14
Move back to Adoptium 14

jacoco does not support Java 15 yet, so need to move the test matrix
back to Adoptium 14.

Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java