fix: update test expectations for Stable Haskell bug report URL

The branding commit changed the bug report URL from
haskell.org/ghc/reportabug to github.com/stable-haskell/ghc/issues.
Update test expectation files to match the new URL output.

Fixes CI failures in T11223_link_order_a_b_2_fail and
T11223_simple_duplicate_lib tests across all platforms.

Author: angerman

testsuite/tests/ghci/linking/T11531.stderr

@@ -7,5 +7,5 @@ the missing library using the -L/path/to/object/dir and -lmissinglibname
 flags, or simply by naming the relevant files on the GHCi command line.
 Alternatively, this link failure might indicate a bug in GHCi.
 If you suspect the latter, please report this as a GHC bug:
-  https://www.haskell.org/ghc/reportabug
+  https://github.com/stable-haskell/ghc/issues
 

testsuite/tests/rts/keep-cafs-fail.stdout

@@ -1,5 +1,5 @@
 KeepCafsMain: internal error: Evaluated a CAF (0xaac9d8) that was GC'd!
     (GHC version 8.7.20180910 for x86_64_unknown_linux)
-    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
+    Please report this as a GHC bug:  https://github.com/stable-haskell/ghc/issues
 Aborted (core dumped)
 exit(134)

testsuite/tests/rts/linker/T11223/T11223_link_order_a_b_2_fail.stderr

@@ -21,5 +21,5 @@ the missing library using the -L/path/to/object/dir and -lmissinglibname
 flags, or simply by naming the relevant files on the GHCi command line.
 Alternatively, this link failure might indicate a bug in GHCi.
 If you suspect the latter, please report this as a GHC bug:
-  https://www.haskell.org/ghc/reportabug
+  https://github.com/stable-haskell/ghc/issues
 

testsuite/tests/rts/linker/T11223/T11223_link_order_a_b_2_fail.stderr-ws-64-mingw32

@@ -21,5 +21,5 @@ the missing library using the -L/path/to/object/dir and -lmissinglibname
 flags, or simply by naming the relevant files on the GHCi command line.
 Alternatively, this link failure might indicate a bug in GHCi.
 If you suspect the latter, please report this as a GHC bug:
-  https://www.haskell.org/ghc/reportabug
+  https://github.com/stable-haskell/ghc/issues
 

testsuite/tests/rts/linker/T11223/T11223_simple_duplicate_lib.stderr

@@ -21,5 +21,5 @@ the missing library using the -L/path/to/object/dir and -lmissinglibname
 flags, or simply by naming the relevant files on the GHCi command line.
 Alternatively, this link failure might indicate a bug in GHCi.
 If you suspect the latter, please report this as a GHC bug:
-  https://www.haskell.org/ghc/reportabug
+  https://github.com/stable-haskell/ghc/issues
 

testsuite/tests/rts/linker/T11223/T11223_simple_duplicate_lib.stderr-ws-64-mingw32

@@ -21,5 +21,5 @@ the missing library using the -L/path/to/object/dir and -lmissinglibname
 flags, or simply by naming the relevant files on the GHCi command line.
 Alternatively, this link failure might indicate a bug in GHCi.
 If you suspect the latter, please report this as a GHC bug:
-  https://www.haskell.org/ghc/reportabug
+  https://github.com/stable-haskell/ghc/issues