Drop Python 3.9 support (#4412)

* Drop Python 3.9 support

Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>

* generate-workflows

Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>

* fixes

Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>

* remove extra reference to pypy310

Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>

* changelog

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* fix flask tests

Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>

* fix google-genai tests

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* fix google-genai tests

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* fix

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* remove unused _ensure_gzip_single_response

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---------

Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>
Co-authored-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>

Author: emdneto

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -8,8 +8,8 @@ body:
       value: |
         Thanks for taking the time to fill out this bug report! Please make sure to fill out the entire form below, providing as much context as you can in order to help us triage and track down your bug as quickly as possible.
 
-        Before filing a bug, please be sure you have searched through [existing bugs](https://github.com/open-telemetry/opentelemetry-python-contrib/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3Abug) to see if your bug is already addressed.  
-  
+        Before filing a bug, please be sure you have searched through [existing bugs](https://github.com/open-telemetry/opentelemetry-python-contrib/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3Abug) to see if your bug is already addressed.
+
   - type: textarea
     id: environment
     attributes:
@@ -18,9 +18,9 @@ body:
         Please describe any aspect of your environment relevant to the problem, including your Python version, [platform](https://docs.python.org/3/library/platform.html), version numbers of installed dependencies, information about your cloud hosting provider, etc. If you're reporting a problem with a specific version of a library in this repo, please check whether the problem has been fixed on main.
       value: |
         OS: (e.g, Ubuntu)
-        Python version: (e.g., Python 3.9.10)
+        Python version: (e.g., Python 3.10.0)
         Package version: (e.g., 0.46.0)
-  
+
   - type: textarea
     attributes:
       label: What happened?