Bump jenkins heap size to 16 gb
Bump jenkins heap size to 16 gb

mitodl/configuration,Stanford-Online/configuration,gsehub/configuration,EDUlib/configuration,gsehub/configuration,edx/configuration,hks-epod/configuration,edx/configuration,stvstnfrd/configuration,hks-epod/configuration,arbrandes/edx-configuration,EDUlib/configuration,EDUlib/configuration,hks-epod/configuration,Stanford-Online/configuration,stvstnfrd/configuration,hks-epod/configuration,mitodl/configuration,stvstnfrd/configuration,arbrandes/edx-configuration,Stanford-Online/configuration,arbrandes/edx-configuration,rue89-tech/configuration,mitodl/configuration,rue89-tech/configuration,edx/configuration,rue89-tech/configuration,EDUlib/configuration,EDUlib/configuration,arbrandes/edx-configuration,stvstnfrd/configuration,stvstnfrd/configuration,appsembler/configuration,rue89-tech/configuration,appsembler/configuration,rue89-tech/configuration,hks-epod/configuration,arbrandes/edx-configuration,gsehub/configuration,gsehub/configuration,Stanford-Online/configuration,appsembler/configuration,gsehub/configuration,appsembler/configuration,edx/configuration,mitodl/configuration,Stanford-Online/configuration