zipapp compression input does not allow valid values

[nate-england]

🐞 bug report

Affected Rule

The issue is caused by the rule: py_zipapp_binary

Is this a regression?

No, this is a new rule

Description

A clear and concise description of the problem...

You're supposed to be able to specify compression per

rules_python/python/private/zipapp/py_zipapp_rule.bzl

Lines 250 to 257 in bac5494

	"compression": attr.string(
	doc = """
	The compression level to use.
	Typically 0 to 9, with higher numbers being to compress more.
	""",
	default = "",
	),

. Bazel requires this value to be a string, so you have to specify it with quotes like "9".

🔬 Minimal Reproduction

Create any py_zipapp_binary and try to specify compression

🔥 Exception or Error

This makes the call unhappy and you get an error like this.
```

Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
usage: zipper_.py [-h] [--compression COMPRESSION]
                  [--workspace-name WORKSPACE_NAME]
                  [--legacy-external-runfiles {0,1}]
                  [--runfiles-dir RUNFILES_DIR]
                  manifest output
zipper_.py: error: argument --compression: invalid int value: '%s'
```

🌍 Your Environment

Operating System:
Linux

Output of bazel version:
8.4.2

Rules_python version:
1.9.0

Anything else relevant?
It looks like a simple format = is missing in the line that is supposed to support compression setting.