Bump amphp/postgres from 1.4.5 to 2.0.0 in /by-language/php-amphp

Bumps [amphp/postgres](https://github.com/amphp/postgres) from 1.4.5 to 2.0.0.
- [Release notes](https://github.com/amphp/postgres/releases)
- [Commits](amphp/postgres@v1.4.5...v2.0.0)

---
updated-dependencies:
- dependency-name: amphp/postgres
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

by-language/php-amphp/composer.json

@@ -14,7 +14,7 @@
     "keywords": ["database", "cratedb", "sql"],
     "require": {
         "php":     "^7.1|^8.0|^8.1|^8.2",
-        "amphp/postgres": "^1.4"
+        "amphp/postgres": "^2.0"
     },
     "scripts": {
         "test": "php basic.php 'host=localhost port=5432 user=crate'"