Remove official support for Python 3.8 (#634)

* Remove official support for Python 3.8

CI tests weren't working just for Python 3.8.
Turns out Python 3.8 reached EOL last year so support should be removed anyway.
https://devguide.python.org/versions/

* Run hatch fmt

Author: pmcollins

.github/workflows/ci-main.yml

@@ -22,7 +22,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
 
     steps:
     - uses: actions/checkout@v4

README.md

@@ -25,7 +25,7 @@ This distribution comes with the following defaults:
 
 ## Requirements
 
-This Splunk Distribution of OpenTelemetry requires Python 3.8 or later. Supported
+This Splunk Distribution of OpenTelemetry requires Python 3.9 or later. Supported
 libraries are listed
 [here](https://github.com/open-telemetry/opentelemetry-python-contrib/tree/main/instrumentation).
 

pyproject.toml

@@ -7,14 +7,13 @@ name = "splunk-opentelemetry"
 dynamic = ["version"]
 description = ''
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 license = "Apache-2.0"
 keywords = []
 authors = []
 classifiers = [
   "Development Status :: 4 - Beta",
   "Programming Language :: Python",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
@@ -69,7 +68,7 @@ cov = [
 ]
 
 [[tool.hatch.envs.all.matrix]]
-python = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+python = ["3.9", "3.10", "3.11", "3.12"]
 
 [tool.hatch.envs.types]
 dependencies = [

tests/ott_init_otel.py

@@ -1,4 +1,5 @@
-from typing import Mapping, Optional, Sequence
+from collections.abc import Mapping, Sequence
+from typing import Optional
 
 from oteltest.telemetry import count_spans
 from ott_lib import project_path, trace_loop

tests/ott_propagator.py

@@ -1,4 +1,5 @@
-from typing import Mapping, Optional, Sequence
+from collections.abc import Mapping, Sequence
+from typing import Optional
 
 from ott_lib import UPSTREAM_PRERELEASE_VERSION, project_path