py-slepc4py: update to 3.8.0

Also, specify a dependency on slepc.

Fixes: https://trac.macports.org/ticket/54120

python/py-slepc4py/Portfile

@@ -5,8 +5,8 @@ PortGroup           python 1.0
 PortGroup           bitbucket 1.0
 PortGroup           mpi 1.0
 
-bitbucket.setup     slepc slepc4py 3.7.0
-revision            1
+bitbucket.setup     slepc slepc4py 3.8.0
+revision            0
 name                py-slepc4py
 categories-append   math
 license             BSD
@@ -17,8 +17,8 @@ long_description    ${description}
 
 maintainers         sean openmaintainer
 
-checksums           rmd160  b7f15b1ee28c07c57aee21db988c5b74882f5f43 \
-                    sha256  139f8bb325dad00a0e8dbe5b3e054050c82547936c1b6e7812fb1a3171c9ad0b
+checksums           rmd160  4eb11e30d5ab1b415977f7fb73e729f945ef7c78 \
+                    sha256  988815b3650b69373be9abbf2355df512dfd200aa74b1785b50a484d6dfee971
 
 mpi.setup           require
 
@@ -37,6 +37,7 @@ if {${subport} ne ${name}} {
 
     depends_lib-append \
                     port:petsc \
+                    port:slepc \
                     port:py${python.version}-petsc4py \
                     port:py${python.version}-numpy