porting tests to r4.5.1

Author: shaneknapp

tests/r/r4.4-rspm/runtime.txt

@@ -0,0 +1 @@
+r-4.5.1-2025-05-13

tests/r/r4.4-rspm/install.R renamed to tests/r/r4.5-rspm/install.R

@@ -1,9 +1,9 @@
 #!/usr/bin/env Rscript
 library('digest')
 
-# Fail if version is not 4.0
+# Fail if version is not 4.5
 print(version)
-if (!(version$major == "4" && as.double(version$minor) >= 4 && as.double(version$minor) < 5)) {
+if (!(version$major == "4" && as.double(version$minor) >= 5 && as.double(version$minor) < 6)) {
   quit("yes", 1)
 }