fix(io): fix input_files/lines data_type

[hanxiao]

fix problem in master also the test failure in #1426

[github-actions]

Latency summary

Current PR yields:

• 😶 index QPS at 2005, delta to last 3 avg.: -4%
• 🐎🐎 query QPS at 39, delta to last 3 avg.: +10%

Breakdown

Version	Index QPS	Query QPS
current	2005	39
0.8.7	2089	35
0.8.6	2076	34
0.8.5	2104	35

Backed by latency-tracking. Further commits will update this comment.

[codecov]

Codecov Report

Merging #1473 (4a49127) into master (08fa53e) will increase coverage by 0.29%.
The diff coverage is 87.64%.

@@            Coverage Diff             @@
##           master    #1473      +/-   ##
==========================================
+ Coverage   82.76%   83.05%   +0.29%     
==========================================
  Files         110      110              
  Lines        6381     6514     +133     
==========================================
+ Hits         5281     5410     +129     
- Misses       1100     1104       +4     

Impacted Files	Coverage Δ
jina/flow/asyncio.py	59.37% <23.07%> (+1.31%)	⬆️
jina/helloworld/components.py	96.42% <92.85%> (-3.58%)	⬇️
jina/clients/sugary_io.py	95.83% <100.00%> (-4.17%)	⬇️
jina/drivers/querylang/queryset/helper.py	92.30% <100.00%> (-0.55%)	⬇️
jina/excepts.py	100.00% <100.00%> (ø)
jina/helloworld/__init__.py	100.00% <100.00%> (ø)
jina/helloworld/helper.py	95.60% <100.00%> (+4.11%)	⬆️
jina/parser.py	86.40% <100.00%> (+0.11%)	⬆️
jina/logging/profile.py	68.33% <0.00%> (-0.58%)	⬇️
... and 28 more

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