Backport: Update database support docs

[nscuro]

Description

Updates database support docs.

• Raise supported versions for PostgreSQL and SQL Server to non-EOL versions
• Add notice about deprecation of RDBMSes other than PostgreSQL in DT v5

Addressed Issue

Backports #3712

Additional Details

N/A

Checklist

• [x] I have read and understand the contributing guidelines
• ~This PR fixes a defect, and I have provided tests to verify that the fix is effective~
• ~This PR implements an enhancement, and I have provided tests to verify that it works as intended~
• ~This PR introduces changes to the database model, and I have added corresponding update logic~
• ~This PR introduces new or alters existing behavior, and I have updated the documentation accordingly~

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: -1.00%)	:white_check_mark: ∅ (target: 70.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (3af6f5a55251d242a2b623f9e1a4d20824dc0145) | 22075 | 16773 | 75.98% | | | Head commit (5f185c309087b0ac9a4730e870c5c0124b206fa7) | 22075 (+0) | 16773 (+0) | 75.98% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#3789) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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