chore(ci): pin PasteDeploy for pylons, pyramid tests (#4323)

## Description
PasteDeploy, which is a dependency of pylons, released a new version 3.0 which includes an f-string and is therefore not Python 2 compatible (see relevant [issue](Pylons/pastedeploy#38)). This is unfortunately breaking our CI so we will pin PasteDeploy to <3.0 for our pylons tests for now.

I've pinned PasteDeploy in our pylons tests and framework tests, as well as pyramid tests (which indirectly rely on PasteDeploy as well).

## Checklist
- [ ] Title must conform to [conventional commit](https://github.com/conventional-changelog/commitlint/tree/master/%40commitlint/config-conventional).
- [ ] Add additional sections for `feat` and `fix` pull requests.
- [ ] Ensure tests are passing for affected code.
- [ ] [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.
- [ ] PR cannot be broken up into smaller PRs.
- [ ] 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.
- [ ] Add to milestone.

Author: Yun-Kim

.github/workflows/test_frameworks.yml

@@ -397,6 +397,8 @@ jobs:
         run: pip install ../ddtrace
       - name: Install test dependencies
         run: pip install -e .[test]
+      - name: Pin PasteDeploy to Python 2.7 compatible version
+        run: pip install pastedeploy==2.1.1
       - name: MarkupSafe fix
         run: pip install --upgrade MarkupSafe==0.18 pip setuptools --force
       - name: Disable failing tests

riotfile.py

@@ -1236,14 +1236,30 @@ def select_pys(min_version=MIN_PYTHON_VERSION, max_version=MAX_PYTHON_VERSION):
         ),
         Venv(
             name="pyramid",
+            command="pytest {cmdargs} tests/contrib/pyramid/test_pyramid.py",
+            pkgs={
+                "requests": [latest],
+                "webtest": [latest],
+                "tests/contrib/pyramid/pserve_app": [latest],
+            },
             venvs=[
                 Venv(
-                    command="pytest {cmdargs} tests/contrib/pyramid/test_pyramid.py",
-                    pys=select_pys(),
+                    # pserve_app has PasteDeploy dependency, but PasteDeploy>=3.0 is incompatible with Python 2.7
+                    # pyramid>=2.0 no longer supports Python 2.7 and 3.5
+                    pys=select_pys(max_version="3.5"),
+                    pkgs={
+                        "pastedeploy": "<3.0",
+                        "pyramid": [
+                            "~=1.7",
+                            "~=1.8",
+                            "~=1.9",
+                            "~=1.10",
+                        ],
+                    },
+                ),
+                Venv(
+                    pys=select_pys(min_version="3.6"),
                     pkgs={
-                        "requests": [latest],
-                        "webtest": [latest],
-                        "tests/contrib/pyramid/pserve_app": [latest],
                         "pyramid": [
                             "~=1.7",
                             "~=1.8",

tox.ini

@@ -189,8 +189,9 @@ deps =
     pylibmc160: pylibmc>=1.6,<1.7
 # webob is required for Pylons < 1.0
     pylons: pylons
-# decorator 5 dropped support for Python 2
+# decorator>=5 and pastedeploy>=3 dropped support for Python 2
     pylons_contrib: decorator<5
+    pylons_contrib: pastedeploy<3
     pylons096: pylons>=0.9.6,<0.9.7
     pylons096: webob<1.1
     pylons097: pylons>=0.9.7,<0.9.8