Update terraform-aws-modules/lambda/aws requirement

Updates the requirements on [terraform-aws-modules/lambda/aws](https://github.com/terraform-aws-modules/terraform-aws-lambda) to permit the latest version.
- [Release notes](https://github.com/terraform-aws-modules/terraform-aws-lambda/releases)
- [Changelog](https://github.com/terraform-aws-modules/terraform-aws-lambda/blob/master/CHANGELOG.md)
- [Commits](terraform-aws-modules/terraform-aws-lambda@v6.4.0...v7.21.0)

---
updated-dependencies:
- dependency-name: terraform-aws-modules/lambda/aws
  dependency-version: 7.21.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

infrastructure/stacks/application/lambda.tf

@@ -1,6 +1,6 @@
 module "change_event_dlq_handler_lambda" {
   source  = "terraform-aws-modules/lambda/aws"
-  version = "v6.4.0"
+  version = "7.21.0"
 
   function_name = var.change_event_dlq_handler_lambda
   description   = "Change Event DLQ Handler lambda"
@@ -40,7 +40,7 @@ module "change_event_dlq_handler_lambda" {
 
 module "dos_db_handler_lambda" {
   source  = "terraform-aws-modules/lambda/aws"
-  version = "v6.4.0"
+  version = "7.21.0"
 
   function_name = var.dos_db_handler_lambda
   description   = "DoS DB Handler lambda"
@@ -94,7 +94,7 @@ module "dos_db_handler_lambda" {
 
 module "dos_db_update_dlq_handler_lambda" {
   source  = "terraform-aws-modules/lambda/aws"
-  version = "v6.4.0"
+  version = "7.21.0"
 
   function_name = var.dos_db_update_dlq_handler_lambda
   description   = "DoS DB Update DLQ Handler lambda"
@@ -133,7 +133,7 @@ module "dos_db_update_dlq_handler_lambda" {
 
 module "event_replay_lambda" {
   source  = "terraform-aws-modules/lambda/aws"
-  version = "v6.4.0"
+  version = "7.21.0"
 
   function_name = var.event_replay_lambda
   description   = "Event Replay lambda"
@@ -175,7 +175,7 @@ module "event_replay_lambda" {
 
 module "ingest_change_event_lambda" {
   source  = "terraform-aws-modules/lambda/aws"
-  version = "v6.4.0"
+  version = "7.21.0"
 
   function_name = var.ingest_change_event_lambda
   description   = "Ingest Change Event lambda"
@@ -216,7 +216,7 @@ module "ingest_change_event_lambda" {
 
 module "send_email_lambda" {
   source  = "terraform-aws-modules/lambda/aws"
-  version = "v6.4.0"
+  version = "7.21.0"
 
   function_name = var.send_email_lambda
   description   = "Send Email lambda"
@@ -258,7 +258,7 @@ module "send_email_lambda" {
 
 module "service_matcher_lambda" {
   source  = "terraform-aws-modules/lambda/aws"
-  version = "v6.4.0"
+  version = "7.21.0"
 
   function_name = var.service_matcher_lambda
   description   = "Service Matcher lambda"
@@ -311,7 +311,7 @@ module "service_matcher_lambda" {
 
 module "service_sync_lambda" {
   source  = "terraform-aws-modules/lambda/aws"
-  version = "v6.4.0"
+  version = "7.21.0"
 
   function_name = var.service_sync_lambda
   description   = "Service Sync lambda"
@@ -371,7 +371,7 @@ module "service_sync_lambda" {
 
 module "slack_messenger_lambda" {
   source  = "terraform-aws-modules/lambda/aws"
-  version = "v6.4.0"
+  version = "7.21.0"
 
   function_name = var.slack_messenger_lambda
   description   = "Slack Messenger lambda"
@@ -412,7 +412,7 @@ module "slack_messenger_lambda" {
 
 module "quality_checker_lambda" {
   source  = "terraform-aws-modules/lambda/aws"
-  version = "v6.4.0"
+  version = "7.21.0"
 
   function_name = var.quality_checker_lambda
   description   = "Quality Checker lambda"