fix the update script to clear cache before it tries to do things

also update pgadmin4 version
9 jobs for master in 2 minutes and 38 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #94517
build_web_backend

00:01:00

 
  Test
passed #94518
test_php_styles

00:00:30

passed #94521
test_web_backend_database

00:00:33

passed #94520
test_web_backend_feature

00:00:39

passed #94519
test_web_backend_unit

00:00:27

 
  Coverage
passed #94522
generate_api_docs

00:00:24

passed #94523
generate_code_coverage

00:00:56

 
  Deploy
manual #94525
allowed to fail manual
deploy_api_docs
manual #94524
allowed to fail manual
deploy_backend_production