Revert "Update bundled gems list at 5caf8bf [ci skip]"

This reverts commit 50282a5.

Author: hsbt

NEWS.md

@@ -327,19 +327,6 @@ The following bundled gems are updated.
 
 * minitest 5.25.4
 * power_assert 2.0.4
-* rake 13.2.1
-* test-unit 3.6.7
-* rexml 3.4.0
-* rss 0.3.1
-* net-ftp 0.3.8
-* net-imap 0.5.2
-* net-smtp 0.5.0
-* prime 0.1.3
-* rbs 3.7.0
-* typeprof 0.30.0
-* debug 1.9.2
-* racc 1.8.1
-
   * 2.0.3 to [v2.0.4][power_assert-v2.0.4]
 * rake 13.2.1
   * 13.1.0 to [v13.2.0][rake-v13.2.0], [v13.2.1][rake-v13.2.1]
@@ -367,18 +354,6 @@ The following bundled gems are updated.
 The following bundled gems are promoted from default gems.
 
 * mutex_m 0.3.0
-* getoptlong 0.2.1
-* base64 0.2.0
-* bigdecimal 3.1.8
-* observer 0.1.2
-* abbrev 0.1.2
-* resolv-replace 0.1.1
-* rinda 0.2.0
-* drb 2.2.1
-* nkf 0.2.0
-* syslog 0.2.0
-* csv 3.3.1
-
   * 0.2.0 to [v0.3.0][mutex_m-v0.3.0]
 * getoptlong 0.2.1
 * base64 0.2.0