bpo-41473: Reenable test_gdb on gdb 9.2 and newer (GH-23637)

https://bugzilla.redhat.com/show_bug.cgi?id=1866884 is fixed in gdb
10.1 (failed to reproduce on gdb-10.1-1.fc34.aarch64).

Author: vstinner

Lib/test/test_gdb.py

@@ -51,11 +51,6 @@ def get_gdb_version():
                             "embedding. Saw %s.%s:\n%s"
                             % (gdb_major_version, gdb_minor_version,
                                gdb_version))
-if (gdb_major_version, gdb_minor_version) >= (9, 2):
-    # gdb 9.2 on Fedora Rawhide is not reliable, see:
-    # * https://bugs.python.org/issue41473
-    # * https://bugzilla.redhat.com/show_bug.cgi?id=1866884
-    raise unittest.SkipTest("https://bugzilla.redhat.com/show_bug.cgi?id=1866884")
 
 if not sysconfig.is_python_build():
     raise unittest.SkipTest("test_gdb only works on source builds at the moment.")

Misc/NEWS.d/next/Tests/2020-12-04-11-47-09.bpo-41473.W_updK.rst

@@ -0,0 +1,3 @@
+Reenable test_gdb on gdb 9.2 and newer:
+https://bugzilla.redhat.com/show_bug.cgi?id=1866884 bug is fixed in gdb
+10.1.