Feedreader reduce log level

[exxamalte]

Proposed change

There are some cases where the initial strict parsing approach of the integration fails (like mismatch of character encoding), but the feed entries could still be extracted successfully.

I am proposing to reduce log level of message from ERROR to WARNING in this case.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example entry for configuration.yaml:

# Example configuration.yaml
feedreader:
  urls:
    - https://www.gdacs.org/xml/rss.xml

Additional information

• This PR fixes or closes issue: fixes Feedreader error on us-ascii/utf-8 #29737
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

• No score or internal
• 🥈 Silver
• 🥇 Gold
• 🏆 Platinum

[codecov]

Codecov Report

Merging #32244 into dev will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##              dev   #32244    +/-   ##
========================================
  Coverage   94.74%   94.74%            
========================================
  Files         768      772     +4     
  Lines       55629    55929   +300     
========================================
+ Hits        52703    52991   +288     
- Misses       2926     2938    +12     

Impacted Files	Coverage Δ
homeassistant/helpers/debounce.py	91.07% <0.00%> (-3.81%)	⬇️
...istant/components/google_assistant/report_state.py	83.33% <0.00%> (-1.67%)	⬇️
homeassistant/components/alexa/state_report.py	83.63% <0.00%> (-0.63%)	⬇️
...meassistant/components/mqtt/vacuum/schema_state.py	91.13% <0.00%> (-0.59%)	⬇️
homeassistant/components/twitch/sensor.py	96.70% <0.00%> (-0.04%)	⬇️
homeassistant/components/mqtt/fan.py	97.96% <0.00%> (ø)	⬆️
homeassistant/components/mqtt/lock.py	100.00% <0.00%> (ø)	⬆️
homeassistant/components/mqtt/const.py	100.00% <0.00%> (ø)	⬆️
homeassistant/components/file/notify.py	100.00% <0.00%> (ø)	⬆️
homeassistant/components/gdacs/const.py	100.00% <0.00%> (ø)	⬆️
... and 49 more

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