fix: & without an explicit lifetime name cannot be used here

[Hywan]

This was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! See https://github.com/ rust-lang/rust/issues/115010.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.02% 🎉

Comparison is base (d6f0635) 77.35% compared to head (f13282e) 77.38%.
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2517      +/-   ##
==========================================
+ Coverage   77.35%   77.38%   +0.02%     
==========================================
  Files         184      184              
  Lines       19560    19560              
==========================================
+ Hits        15131    15136       +5     
+ Misses       4429     4424       -5     

Files Changed	Coverage Δ
crates/matrix-sdk-base/src/store/traits.rs	73.68% <ø> (ø)
crates/matrix-sdk-crypto/src/machine.rs	83.07% <ø> (ø)
crates/matrix-sdk-ui/src/notification_client.rs	62.75% <ø> (ø)

... and 1 file with indirect coverage changes

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