attempt upgrade of pywps and owslib dependencies

[fmigneault]

Changes

• pin pywps==4.5.0 and owslib==0.25.0 as tentative resolution of XML security issue (relates to Fix lxml default parser geopython/pywps#616, Integrate lxml patch from 4.4 branch geopython/pywps#618 and Invalid XML security version geopython/pywps#624)
• apply some other fixes due to problems introduced in pywps==4.5.0
• apply same XML security patch as pywps
• apply Accept-Language negotiation and forward to pywps/owslib to avoid error of unsupported language

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-39371

Closes #311

[codecov]

Codecov Report

Merging #307 (4ff4a39) into master (d312f8b) will increase coverage by 0.01%.
The diff coverage is 78.46%.

@@            Coverage Diff             @@
##           master     #307      +/-   ##
==========================================
+ Coverage   74.07%   74.09%   +0.01%     
==========================================
  Files          61       62       +1     
  Lines        9845     9863      +18     
  Branches     1485     1487       +2     
==========================================
+ Hits         7293     7308      +15     
- Misses       2132     2133       +1     
- Partials      420      422       +2     

Impacted Files	Coverage Δ
weaver/formats.py	96.66% <ø> (ø)
weaver/typedefs.py	0.00% <ø> (-100.00%)	⬇️
weaver/processes/opensearch.py	57.46% <20.00%> (ø)
weaver/processes/builtin/metalink2netcdf.py	55.55% <50.00%> (+1.50%)	⬆️
weaver/datatype.py	68.16% <60.00%> (-0.05%)	⬇️
weaver/wps/utils.py	77.55% <73.68%> (-0.40%)	⬇️
weaver/wps/service.py	76.58% <83.33%> (-0.05%)	⬇️
weaver/xml_util.py	88.88% <88.88%> (ø)
weaver/processes/convert.py	76.05% <100.00%> (ø)
weaver/processes/execution.py	77.94% <100.00%> (+0.24%)	⬆️
... and 5 more

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