error when executing a executable builded by pyinstaller

I'm trying to use pyinstaller to build a executable with juliacall , here is my code:

```python
from juliacall import Main as jl

def hello(u = "world"):
jl.println(f"hello {u}!")

hello()
```

This works good in REPL, but runs into a error after pack it into a executable using pyinstaller:

```
Querying Julia versions from https://julialang-s3.julialang.org/bin/versions.json
Found Julia 1.7.1 at 'C:\\Users\\ash\\.julia\\pythoncall\\julia-1.7.1\\bin\\julia.exe'
isdev: False
JULIA_PYTHONCALL_LIBPTR: 140717263618048
JULIA_PYTHONCALL_EXE: D:\codehub\Instrument.jl\EC22.jl\temp\dist\hello\hello.exe
script:

try
if ENV["JULIA_PYTHONCALL_EXE"] != "" && get(ENV, "PYTHON", "") == ""
# Ensures PyCall uses the same Python executable
ENV["PYTHON"] = ENV["JULIA_PYTHONCALL_EXE"]
end
import Pkg
Pkg.activate(raw"C:\Users\ash\.julia\environments\PythonCall", io=devnull)
Pkg.add([Pkg.PackageSpec(name="PythonCall", uuid="6099a3de-0909-46bc-b1f4-468b9a2dfc0d")])
import PythonCall
catch err
@error "Error loading PythonCall.jl" err=err
rethrow()
end

Updating registry at `C:\Users\ash\.julia\registries\General.toml`
Resolving package versions...
Updating `C:\Users\ash\.julia\environments\PythonCall\Project.toml`
[6099a3de] + PythonCall v0.4.3
Updating `C:\Users\ash\.julia\environments\PythonCall\Manifest.toml`
[8f4d0f93] + Conda v1.6.0
[9a962f9c] + DataAPI v1.9.0
[e2d170a0] + DataValueInterfaces v1.0.0
[82899510] + IteratorInterfaceExtensions v1.0.0
[682c06a0] + JSON v0.21.2
[1914dd2f] + MacroTools v0.5.9
[69de0a69] + Parsers v2.1.3
[6099a3de] + PythonCall v0.4.3
[ae029012] + Requires v1.2.0
[3783bdb8] + TableTraits v1.0.1
[bd369af6] + Tables v1.6.1
[e17b2a0c] + UnsafePointers v1.0.0
[81def892] + VersionParsing v1.2.1
[0dad84c5] + ArgTools
[56f22d72] + Artifacts
[2a0f44e3] + Base64
[ade2ca70] + Dates
[f43a241f] + Downloads
[b77e0a4c] + InteractiveUtils
[b27032c2] + LibCURL
[76f85450] + LibGit2
[8f399da3] + Libdl
[37e2e46d] + LinearAlgebra
[56ddb016] + Logging
[d6f4376e] + Markdown
[a63ad114] + Mmap
[ca575930] + NetworkOptions
[44cfe95a] + Pkg
[de0858da] + Printf
[3fa0cd96] + REPL
[9a3f8284] + Random
[ea8e919c] + SHA
[9e88b42a] + Serialization
[6462fe0b] + Sockets
[fa267f1f] + TOML
[a4e569a6] + Tar
[8dfed614] + Test
[cf7118a7] + UUIDs
[4ec0a83e] + Unicode
[e66e0078] + CompilerSupportLibraries_jll
[deac9b47] + LibCURL_jll
[29816b5a] + LibSSH2_jll
[c8ffd9c3] + MbedTLS_jll
[14a3606d] + MozillaCACerts_jll
[4536629a] + OpenBLAS_jll
[83775a58] + Zlib_jll
[8e850b90] + libblastrampoline_jll
[8e850ede] + nghttp2_jll
[3f19e933] + p7zip_jll
Precompiling project...
1 dependency successfully precompiled in 15 seconds (18 already precompiled)
res: None

Traceback (most recent call last):
File "hello.py", line 1, in
File "", line 1027, in _find_and_load
File "", line 1006, in _find_and_load_unlocked
File "", line 688, in _load_unlocked
File "PyInstaller\loader\pyimod03_importers.py", line 476, in exec_module
File "juliacall\__init__.py", line 4, in
File "", line 1027, in _find_and_load
File "", line 1006, in _find_and_load_unlocked
File "", line 688, in _load_unlocked
File "PyInstaller\loader\pyimod03_importers.py", line 476, in exec_module
File "juliacall\init.py", line 167, in
Exception: PythonCall.jl did not start properly
[6060] Failed to execute script 'hello' due to unhandled exception!
```

**I installed juliacall by `pip install -e .` in order to do some modification with `juliacall/init.py` to print some info.**
here is my modification with `juliacall/init.py`
```python
...
script = '''
try
if ENV["JULIA_PYTHONCALL_EXE"] != "" && get(ENV, "PYTHON", "") == ""
# Ensures PyCall uses the same Python executable
ENV["PYTHON"] = ENV["JULIA_PYTHONCALL_EXE"]
end
import Pkg
Pkg.activate(raw"{}", io=devnull)
{}
import PythonCall
catch err
@error "Error loading PythonCall.jl" err=err
rethrow()
end
'''.format(jlenv, install, c.pythonapi._handle)

# print some info
print(f"isdev: {isdev}")
print(f"JULIA_PYTHONCALL_LIBPTR: {os.environ['JULIA_PYTHONCALL_LIBPTR']}")
print(f"JULIA_PYTHONCALL_EXE: {os.environ['JULIA_PYTHONCALL_EXE']}")
print(f"script:\n{script}\n")
res = lib.jl_eval_string(script.encode('utf8'))
print(f"res: {res}\n")

...
```