bump msrv to 1.78

[cmeissl]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 19.66%. Comparing base (d5cedee) to head (b95f375). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/wayland/shm/pool.rs	50.00%	1 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1546   +/-   ##
=======================================
  Coverage   19.66%   19.66%           
=======================================
  Files         169      169           
  Lines       27749    27749           
=======================================
  Hits         5456     5456           
  Misses      22293    22293           

Flag	Coverage Δ
wlcs-buffer	17.07% <50.00%> (ø)
wlcs-core	16.81% <50.00%> (ø)
wlcs-output	6.90% <0.00%> (ø)
wlcs-pointer-input	18.60% <50.00%> (ø)

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[Drakulix]

Superseded by the version bump in https://github.com/Smithay/smithay/pull/1576