fix(httpx): manually construct removed URL.raw property (#4595)

## Description
[As of `httpx==0.23.1`](encode/httpx#2241), the `URL.raw` property was removed, which broke our `_url_to_str()` helper that uses that property to construct the raw URL.

However, the removed property was simply a combination of already existing (and still existing) properties in the `URL` object, which we can use to manually consturct the raw URL. I've version gated it such that nothing's changed for previous versions of `httpx`, but moving forward we'll manually construct the raw URL.

## Checklist
- [x] Add additional sections for `feat` and `fix` pull requests.
- [x] [Library documentation](https://github.com/DataDog/dd-trace-py/tree/1.x/docs) and/or [Datadog's documentation site](https://github.com/DataDog/documentation/) is updated. Link to doc PR in description.

## Motivation

## Design

## Testing strategy

## Relevant issue(s)

## Testing strategy

## Reviewer Checklist
- [ ] Title is accurate.
- [ ] Description motivates each change.
- [ ] No unnecessary changes were introduced in this PR.
- [ ] Avoid breaking [API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces) changes unless absolutely necessary.
- [ ] Tests provided or description of manual testing performed is included in the code or PR.
- [ ] Release note has been added for fixes and features, or else `changelog/no-changelog` label added.
- [ ] All relevant GitHub issues are correctly linked.
- [ ] Backports are identified and tagged with Mergifyio.

(cherry picked from commit 6a1948d)

ddtrace/contrib/httpx/patch.py

@@ -24,6 +24,8 @@
     from ddtrace import Span
     from ddtrace.vendor.wrapt import BoundFunctionWrapper
 
+HTTPX_VERSION = tuple(map(int, httpx.__version__.split(".")))
+
 config._add(
     "httpx",
     {
@@ -39,7 +41,14 @@ def _url_to_str(url):
     """
     Helper to convert the httpx.URL parts from bytes to a str
     """
-    scheme, host, port, raw_path = url.raw
+    # httpx==0.23.1 removed URL.raw, must construct it manually
+    if HTTPX_VERSION >= (0, 23, 1):
+        scheme = url.raw_scheme
+        host = url.raw_host
+        port = url.port
+        raw_path = url.raw_path
+    else:
+        scheme, host, port, raw_path = url.raw
     url = scheme + b"://" + host
     if port is not None:
         url += b":" + ensure_binary(str(port))

riotfile.py

@@ -1716,7 +1716,7 @@ def select_pys(min_version=MIN_PYTHON_VERSION, max_version=MAX_PYTHON_VERSION):
                     "~=0.16.0",
                     "~=0.17.0",
                     "~=0.18.0",
-                    "<1.0.0",
+                    "~=0.22.0",
                     latest,
                 ],
             },