chore(deps): upgrade twilio-ruby to 7.6.0 for upcoming features (#12243)

### Summary

- Update Twilio gem to support latest features and API changes.
- No app code changes; Gemfile and Gemfile.lock only.

references: #11602 , #11481 

### Testing

- Existing Twilio SMS: send/receive still works; delivery status
updates.
- Existing Twilio WhatsApp: send/receive still works; templates (if
used) unaffected.
- Create new Twilio SMS/WhatsApp inboxes: can be created and can
send/receive messages.

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

Gemfile.lock

@@ -252,8 +252,10 @@ GEM
       railties (>= 5.0.0)
     faker (3.2.0)
       i18n (>= 1.8.11, < 2)
-    faraday (2.9.0)
-      faraday-net_http (>= 2.0, < 3.2)
+    faraday (2.13.1)
+      faraday-net_http (>= 2.0, < 3.5)
+      json
+      logger
     faraday-follow_redirects (0.3.0)
       faraday (>= 1, < 3)
     faraday-mashify (0.1.1)
@@ -261,8 +263,8 @@ GEM
       hashie
     faraday-multipart (1.0.4)
       multipart-post (~> 2)
-    faraday-net_http (3.1.0)
-      net-http
+    faraday-net_http (3.4.0)
+      net-http (>= 0.5.0)
     faraday-net_http_persistent (2.1.0)
       faraday (~> 2.5)
       net-http-persistent (~> 4.0)
@@ -421,7 +423,7 @@ GEM
     judoscale-sidekiq (1.8.2)
       judoscale-ruby (= 1.8.2)
       sidekiq (>= 5.0)
-    jwt (2.8.1)
+    jwt (2.10.1)
       base64
     kaminari (1.2.2)
       activesupport (>= 4.1.0)
@@ -503,7 +505,7 @@ GEM
     mutex_m (0.3.0)
     neighbor (0.2.3)
       activerecord (>= 5.2)
-    net-http (0.4.1)
+    net-http (0.6.0)
       uri
     net-http-persistent (4.0.2)
       connection_pool (~> 2.2)
@@ -849,7 +851,7 @@ GEM
       i18n
     timeout (0.4.3)
     trailblazer-option (0.1.2)
-    twilio-ruby (5.77.0)
+    twilio-ruby (7.6.0)
       faraday (>= 0.9, < 3.0)
       jwt (>= 1.5, < 3.0)
       nokogiri (>= 1.6, < 2.0)
@@ -1041,7 +1043,7 @@ DEPENDENCIES
   telephone_number
   test-prof
   time_diff
-  twilio-ruby (~> 5.66)
+  twilio-ruby
   twitty (~> 0.1.5)
   tzinfo-data
   uglifier