chore: bump compat requirements

PencilFFTs to 0.14 and MPI to 0.20

There is a strange error when I run with PencilFFTs v0.14 and MPI
v0.19.  MPI v0.20 works.  Exclude earlier versions of MPI.jl.

MPI v0.20 deprecats `MPI.Dims_create` in favour of `MPI.Dims_create`.

Also forced to use julia version 1.7.  Stop support for 1.6, start
testing against 1.8.

Author: CompatHelper Julia

.github/workflows/ci.yml

@@ -15,8 +15,8 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.6'
           - '1.7'
+          - '1.8'
           # - 'nightly'
         os:
           - ubuntu-latest

Project.toml

@@ -1,7 +1,7 @@
 name = "UltraDark"
 uuid = "1c8d022d-dfc0-4b41-80ab-3fc7e88cdfea"
 authors = ["Nathan Musoke <[email protected]>"]
-version = "0.8.0"
+version = "0.9.0"
 
 [deps]
 AbstractFFTs = "621f4979-c628-5d54-868e-fcf4e3e8185c"
@@ -17,8 +17,8 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 [compat]
 AbstractFFTs = "0.5, 1.0"
 FFTW = "1.2"
-MPI = "0.16, 0.17, 0.18, 0.19"
+MPI = "0.20"
 NPZ = "0.4"
 PencilArrays = "0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17"
-PencilFFTs = "0.12, 0.13"
-julia = "1.6"
+PencilFFTs = "0.12, 0.13, 0.14"
+julia = "1.7"

src/pencil_grids.jl

@@ -201,7 +201,7 @@ function PencilGrids(length_tuple, resol_tuple::Tuple{Int,Int,Int})::PencilGrids
 
     # Let MPI_Dims_create choose the decomposition.
     proc_dims = let pdims = zeros(Int, 2)
-        MPI.Dims_create!(Nproc, pdims)
+        pdims .= MPI.Dims_create(Nproc, pdims)
         pdims[1], pdims[2]
     end