Vault module missing get() method?

Trying to use the PDK to read a secret from Kong vault:

`eg_public_key = kong.vault.get("vault://azure/eg-pbk-certs")`

However, when this executes:

```
2024/05/13 15:41:01 [info] 2387#0: *1525 [python-plugin:2400] File "/usr/local/kong/python/jwt-validator.py", line 111, in __init__, context: ngx.timer
2024/05/13 15:41:01 [info] 2387#0: *1525 [python-plugin:2400] eg_public_key = kong.vault.get("vault://azure/eg-pbk-certs"), context: ngx.timer
2024/05/13 15:41:01 [info] 2387#0: *1525 [python-plugin:2400] AttributeError: module 'kong_pdk.pdk.kong.vault' has no attribute 'get', context: ngx.timer
2024/05/13 15:41:01 [error] 2395#0: *2568 [kong] init.lua:247 [e451-jwt-validator] starting instance: module 'kong_pdk.pdk.kong.vault' has no attribute 'get', client: 192.168.65.1, server: kong, request: "GET /jwttest HTTP/1.1", host: "localhost:8000", request_id: "f110d743b81f6750e86b1a4fc69ecc4e"
```

I can see it defined [here](https://github.com/Kong/kong-python-pdk/blob/master/kong_pdk/pdk/kong/vault.py#L28-L47), so not sure how to resolve this. I'm pulling v0.36 of the kong-pdk package, which I believe is the most current (though apparently nearly a year old at this point).

Start with kong_pdk/pdk/kong/vault.py, especially the get() definition linked in the issue, and compare it with the v0.36 package actually installed by the Python plugin. Reproduce the import and call shown in the report; done means explaining why get() is unavailable at runtime and identifying the package or release state that resolves the mismatch.

Written by the indexing model from the issue text.