chore: add bash version requirement in devopment doc (cloudnative-pg#2152)

Signed-off-by: Armando Ruocco <armando.ruocco@enterprisedb.com>

Author: armru

contribute/development_environment/README.md

@@ -85,6 +85,11 @@ brew install go \
   goreleaser
 ```
 
+Please note that bash v5.0+ is required, this can be installed with:
+``` bash
+brew install bash
+```
+
 >**⚠️ Note:**
 >If `kind` is already installed, make sure you have the latest version:
 >