BLD: Set scipy latest supported version to 1.11 (#602)

Co-authored-by: Ian Harrison <itrharrison@gmail.com>

tox.ini

@@ -2,7 +2,7 @@
 envlist =
     py{37,38,39,310,311}-test{,-all}{,-dev,-latest,-oldest}{,-cov}
     py{37,38,39,310,311}-test-numpy{116,117,118,119,120,121,122,123,124,125}
-    py{37,38,39,310,311}-test-scipy{12,13,14,15,16,17,18,19,110}
+    py{37,38,39,310,311}-test-scipy{12,13,14,15,16,17,18,19,110,111}
     py{37,38,39,310,311}-test-astropy{40,41,42,43,50,51,52}
     build_docs
     linkcheck
@@ -55,6 +55,7 @@ description =
     scipy18: with scipy 1.8.*
     scipy19: with scipy 1.9.*
     scipy110: with scipy 1.10.*
+    scipy111: with scipy 1.11.*
     astropy40: with astropy 4.0.*
     astropy41: with astropy 4.1.*
     astropy42: with astropy 4.2.*
@@ -86,6 +87,7 @@ deps =
     scipy18: scipy==1.8.*
     scipy19: scipy==1.9.*
     scipy110: scipy==1.10.*
+    scipy111: scipy==1.11.*
 
     astropy40: astropy==4.0.*
     astropy41: astropy==4.1.*
@@ -101,7 +103,7 @@ deps =
 
     latest: astropy==5.2.*
     latest: numpy==1.25.*
-    latest: scipy==1.10.*
+    latest: scipy==1.11.*
 
     oldest: astropy==4.0.*
     oldest: numpy==1.16.*