chore(deps): Update Terraform terraform-google-modules/sql-db/google to v20

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This PR contains the following updates:

Package	Type	Update	Change
terraform-google-modules/sql-db/google (source)	module	major	~> 18.0 -> ~> 20.0

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Release Notes

terraform-google-modules/terraform-google-sql-db (terraform-google-modules/sql-db/google)

### [`v20.0.0`](https://togithub.com/terraform-google-modules/terraform-google-sql-db/blob/HEAD/CHANGELOG.md#2000-2024-03-08) [Compare Source](https://togithub.com/terraform-google-modules/terraform-google-sql-db/compare/v19.0.0...v20.0.0) ##### ⚠ BREAKING CHANGES - **TPG>=5.12:** Add option to create and failover a replica instance in Postgresql and MsSQL sub-module ([#​582](https://togithub.com/terraform-google-modules/terraform-google-sql-db/issues/582)) - **TPG>=5.6:** bump required google provider to 5.6 for postgres ##### Features - **TPG>=5.12:** Add option to create and failover a replica instance in Postgresql and MsSQL sub-module ([#​582](https://togithub.com/terraform-google-modules/terraform-google-sql-db/issues/582)) ([141e54a](https://togithub.com/terraform-google-modules/terraform-google-sql-db/commit/141e54a9256feae704220ceed24c9a94ebaf7e27)) ##### Bug Fixes - mark replicas_instance_server_ca_certs output as sensitive ([#​579](https://togithub.com/terraform-google-modules/terraform-google-sql-db/issues/579)) ([faa064e](https://togithub.com/terraform-google-modules/terraform-google-sql-db/commit/faa064e069a4678f54e6688825e85dcfb3dcf1c2)) - **TPG>=5.6:** bump required google provider to 5.6 for postgres ([0d3b434](https://togithub.com/terraform-google-modules/terraform-google-sql-db/commit/0d3b43426b93c1492f6a82e3367e40f2d41b0edc)) ### [`v19.0.0`](https://togithub.com/terraform-google-modules/terraform-google-sql-db/blob/HEAD/CHANGELOG.md#1900-2024-02-08) [Compare Source](https://togithub.com/terraform-google-modules/terraform-google-sql-db/compare/v18.2.0...v19.0.0) ##### ⚠ BREAKING CHANGES - Allow passing ssl_mode for MySQL Module ([#​575](https://togithub.com/terraform-google-modules/terraform-google-sql-db/issues/575)) ##### Features - Allow passing ssl_mode for MySQL Module ([#​575](https://togithub.com/terraform-google-modules/terraform-google-sql-db/issues/575)) ([c7ab6ec](https://togithub.com/terraform-google-modules/terraform-google-sql-db/commit/c7ab6ecbcdfaaee94586b2251ff643d05311a5cc)) - Make MySQL CloudSQL zone optional ([#​572](https://togithub.com/terraform-google-modules/terraform-google-sql-db/issues/572)) ([3c4b504](https://togithub.com/terraform-google-modules/terraform-google-sql-db/commit/3c4b504671cffc222b408b1f3051175837757b1e)) ##### Bug Fixes - **backup:** backups are not deleted when retained nr of backups >= 20 ([#​566](https://togithub.com/terraform-google-modules/terraform-google-sql-db/issues/566)) ([6c4b0e3](https://togithub.com/terraform-google-modules/terraform-google-sql-db/commit/6c4b0e38b7d37e67107955da3d9a46e691b3f47a)) - Cloud SQL does not support multiple deny_maintenance_period block. Update variable description ([#​564](https://togithub.com/terraform-google-modules/terraform-google-sql-db/issues/564)) ([9e55c87](https://togithub.com/terraform-google-modules/terraform-google-sql-db/commit/9e55c87c54371780f175734212abce3e4d4963c3)) - **deps:** Update cft/developer-tools Docker tag to v1.19 ([#​571](https://togithub.com/terraform-google-modules/terraform-google-sql-db/issues/571)) ([bd18ee6](https://togithub.com/terraform-google-modules/terraform-google-sql-db/commit/bd18ee68a2a05c5587706d9cbca6023b8eab0ae1)) - Improve MySQL root_password documentation ([#​573](https://togithub.com/terraform-google-modules/terraform-google-sql-db/issues/573)) ([611edfd](https://togithub.com/terraform-google-modules/terraform-google-sql-db/commit/611edfd8d72d4560c629fa8e3863932eb309323d))

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