Fix some mypy errors

[gsingh93]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1281 (c1fab0d) into dev (fbedf0b) will increase coverage by 0.13%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##              dev    #1281      +/-   ##
==========================================
+ Coverage   54.87%   55.00%   +0.13%     
==========================================
  Files         182      183       +1     
  Lines       20267    20321      +54     
  Branches     1878     1883       +5     
==========================================
+ Hits        11121    11178      +57     
+ Misses       8727     8720       -7     
- Partials      419      423       +4     

Impacted Files	Coverage Δ
pwndbg/gdblib/tls.py	28.78% <0.00%> (ø)
pwndbg/color/syntax_highlight.py	45.65% <100.00%> (+2.47%)	⬆️
pwndbg/commands/reload.py	39.28% <100.00%> (-5.88%)	⬇️
pwndbg/gdblib/events.py	68.79% <100.00%> (+1.14%)	⬆️
pwndbg/gdblib/regs.py	69.93% <100.00%> (+0.19%)	⬆️
pwndbg/gdblib/stack.py	73.13% <100.00%> (+0.40%)	⬆️
pwndbg/gdblib/symbol.py	43.95% <100.00%> (+0.30%)	⬆️
pwndbg/lib/net.py	86.04% <100.00%> (+0.16%)	⬆️
pwndbg/commands/heap.py	60.71% <0.00%> (-0.47%)	⬇️
tests/test_hexdump.py	100.00% <0.00%> (ø)
... and 4 more

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