BLD: Set numpy latest supported version to 1.22 (#506)

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 envlist =
     py{36,37,38,39,310}-test{,-all}{,-dev,-latest,-oldest}{,-cov}
-    py{36,37,38,39,310}-test-numpy{116,117,118,119,120,121}
+    py{36,37,38,39,310}-test-numpy{116,117,118,119,120,121,122}
     py{36,37,38,39,310}-test-scipy{12,13,14,15,16,17}
     py{36,37,38,39,310}-test-astropy{40,41,42,43,50}
     build_docs
@@ -44,6 +44,7 @@ description =
     numpy119: with numpy 1.19.*
     numpy120: with numpy 1.20.*
     numpy121: with numpy 1.21.*
+    numpy122: with numpy 1.22.*
     scipy12: with scipy 1.2.*
     scipy13: with scipy 1.3.*
     scipy14: with scipy 1.4.*
@@ -65,6 +66,7 @@ deps =
     numpy119: numpy==1.19.*
     numpy120: numpy==1.20.*
     numpy121: numpy==1.21.*
+    numpy122: numpy==1.22.*
 
     scipy12: scipy==1.2.*
     scipy13: scipy==1.3.*
@@ -84,7 +86,7 @@ deps =
     dev: git+https://github.com/astropy/astropy.git#egg=astropy
 
     latest: astropy==5.0.*
-    latest: numpy==1.21.*
+    latest: numpy==1.22.*
     latest: scipy==1.7.*
 
     oldest: astropy==4.0.*