chore(deps): Switch html2text back to rubygems (#10911)

## Description

Hi! I've recently started helping maintain this gem as we use it heavily
in our app as well. It's been updated to work with newer versions of
nokogiri and has a few important fixes too.

## How Has This Been Tested?

Assuming you already have test coverage that would cover this.

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [x] Any dependent changes have been merged and published in downstream
modules

Co-authored-by: Sojan Jose <sojan@pepalo.com>

Gemfile

@@ -138,9 +138,7 @@ gem 'procore-sift'
 # parse email
 gem 'email_reply_trimmer'
 
-# TODO: we might have to fork this gem since 0.3.1 has hard depency on nokogir 1.10.
-# and this gem hasn't been updated for a while.
-gem 'html2text', git: 'https://github.com/chatwoot/html2text_ruby', branch: 'chatwoot'
+gem 'html2text'
 
 # to calculate working hours
 gem 'working_hours'

Gemfile.lock

@@ -22,14 +22,6 @@ GIT
       devise (>= 4.0.0, < 5.0.0)
       railties (>= 5.0.0, < 8.0.0)
 
-GIT
-  remote: https://github.com/chatwoot/html2text_ruby
-  revision: cdbdbbbf898d846d0136d69d688a003c6b26074b
-  branch: chatwoot
-  specs:
-    html2text (0.3.1)
-      nokogiri (>= 1.13.6)
-
 GEM
   remote: https://rubygems.org/
   specs:
@@ -361,6 +353,8 @@ GEM
     hana (1.3.7)
     hashdiff (1.1.0)
     hashie (5.0.0)
+    html2text (0.4.0)
+      nokogiri (>= 1.0, < 2.0)
     http (5.1.1)
       addressable (~> 2.8)
       http-cookie (~> 1.0)
@@ -503,14 +497,14 @@ GEM
     newrelic_rpm (9.6.0)
       base64
     nio4r (2.7.3)
-    nokogiri (1.17.1)
+    nokogiri (1.18.2)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
-    nokogiri (1.17.1-arm64-darwin)
+    nokogiri (1.18.2-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.17.1-x86_64-darwin)
+    nokogiri (1.18.2-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.17.1-x86_64-linux)
+    nokogiri (1.18.2-x86_64-linux-gnu)
       racc (~> 1.4)
     oauth (1.1.0)
       oauth-tty (~> 1.0, >= 1.0.1)
@@ -897,7 +891,7 @@ DEPENDENCIES
   haikunator
   hairtrigger
   hashie
-  html2text!
+  html2text
   image_processing
   jbuilder
   json_refs