MONGOID-5171 - Make the minimum Ruby version 2.5 (#5058)

* MONGOID-5171 - Make the minimum Ruby version 2.5. Also get rid of the "ruby_version" module, which seems unused/out-of-date.

* revert doc change

* add 7.4 to compat tables removing Ruby 2.3/2.4 from it

Co-authored-by: shields <[email protected]>
Co-authored-by: Oleg Pudeyev <[email protected]>

Author: johnnyshields

source/reference/compatibility.txt

@@ -34,6 +34,10 @@ specified Mongoid versions.
      - Driver 2.15-2.10
      - Driver 2.9-2.7
 
+   * - 7.4
+     - |checkmark|
+     -
+
    * - 7.3
      - |checkmark|
      -
@@ -77,6 +81,16 @@ is deprecated.
      - Ruby 2.2
      - JRuby 9.2
 
+   * - 7.4
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     -
+     -
+     -
+     - |checkmark|
+
    * - 7.3
      - |checkmark| [#mongoid-7.3-ruby-3.0]_
      - |checkmark|
@@ -165,6 +179,16 @@ for driver compatibility matrices.
      - MongoDB 3.0
      - MongoDB 2.6
 
+   * - 7.4
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+     - |checkmark|
+
    * - 7.3
      - |checkmark|
      - |checkmark|
@@ -237,6 +261,14 @@ are supported by Mongoid.
      - Rails 5.0
      - Rails 4.2
 
+   * - 7.4
+     - |checkmark|
+     - |checkmark|
+     - |checkmark| [#rails-5-ruby-3.0]_
+     - |checkmark| [#rails-5-ruby-3.0]_
+     -
+     -
+
    * - 7.3
      - |checkmark|
      - |checkmark|

source/release-notes/mongoid-7.4.txt

@@ -18,6 +18,13 @@ please consult GitHub releases for detailed release notes and JIRA for
 the complete list of issues fixed in each release, including bug fixes.
 
 
+Ruby Version Support
+--------------------
+
+As of version 7.4, Mongoid supports Ruby 2.5+.
+Support for Ruby 2.4 and earlier has been dropped.
+
+
 ``===`` Operator Matches Ruby Semantics
 ---------------------------------------