prepare changelog for 6.0.0 release

Author: marwen-abid

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/).
 ### Added
 
 - Add Launch Wizard through `make setup` command to simplify initial setup and mainnet configuration for docker compose [#875](https://github.com/stellar/stellar-disbursement-platform-backend/pull/875)
+    - Add `--env-file` command line argument to support multiple environment file contexts [#963](https://github.com/stellar/stellar-disbursement-platform-backend/pull/963) 
 - Add HTTPS mode to setup wizard [#957](https://github.com/stellar/stellar-disbursement-platform-backend/pull/957)
 - Support for SEP-10 and SEP-24 endpoints in the SDP [#834](https://github.com/stellar/stellar-disbursement-platform-backend/pull/834)
     - Add SEP10 /auth endpoints 
@@ -25,10 +26,19 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/).
 
 ### Fixed
 
-- Fix HTML validation to allow apostrophes in invitation messages while maintaining security against XSS attacks [#930](https://github.com/stellar/stellar-disbursement-platform-backend/pull/930)
+- Fix HTML validation to allow apostrophes in invitation messages while maintaining security against XSS attacks [#931](https://github.com/stellar/stellar-disbursement-platform-backend/pull/931)
 - Refactor to replace float64 with shopspring decimal [#936](https://github.com/stellar/stellar-disbursement-platform-backend/pull/936)
 - `channel-accounts ensure` command should have a minimum of 1 [#939](https://github.com/stellar/stellar-disbursement-platform-backend/pull/939)
 
+### Security and Dependencies
+
+- Bump the minor-and-patch group with 5 updates [#961](https://github.com/stellar/stellar-disbursement-platform-backend/pull/961)
+- Bump the minor-and-patch group across 1 directory with 12 updates [#955](https://github.com/stellar/stellar-disbursement-platform-backend/pull/955)
+- Bump actions/checkout from 5 to 6 in the all-actions group [#954](https://github.com/stellar/stellar-disbursement-platform-backend/pull/954)
+- Bump js-yaml from 4.1.0 to 4.1.1 in the npm_and_yarn group [#947](https://github.com/stellar/stellar-disbursement-platform-backend/pull/947)
+- Bump golang from 1.25.3-alpine to 1.25.4-alpine in the all-docker group [#940](https://github.com/stellar/stellar-disbursement-platform-backend/pull/940)
+- Bump the minor-and-patch group with 7 updates [#933](https://github.com/stellar/stellar-disbursement-platform-backend/pull/933)
+
 ## [5.0.0](https://github.com/stellar/stellar-disbursement-platform-backend/releases/tag/5.0.0) ([diff](https://github.com/stellar/stellar-disbursement-platform-backend/compare/4.1.0...5.0.0))
 
 ### Added