Fixing starlette template handling

[djpugh]

Closes #72 - switches to overriding the env attribute rather than via getenv, due to encode/starlette#1218

[codecov]

Codecov Report

Merging #75 (279777f) into main (4089ca0) will increase coverage by 0.03%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
+ Coverage   42.95%   42.98%   +0.03%     
==========================================
  Files          29       29              
  Lines        1413     1412       -1     
==========================================
  Hits          607      607              
+ Misses        806      805       -1     

Flag	Coverage Δ
tests	42.98% <33.33%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/fastapi_aad_auth/ui/jinja.py	42.85% <33.33%> (+1.94%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4089ca0...279777f. Read the comment docs.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[robintw]

@djpugh Is it possible to release a new version to PyPI which includes this fix? I'm running into issues with pinning the fastapi version to 0.69 to get around this.