Update littlefs2 to v0.5.0

[robin-nitrokey]

Depends on:

• Release v0.5.0 trussed-dev/littlefs2#85
• Update littlefs2 trussed-dev/trussed#171
• Update littlefs2 to v0.5.0 admin-app#33
• Update littlefs2 to v0.5.0 fido-authenticator#107
• Update littlefs2 to v0.5.0 lpc55/lpc55-hal#69
• Update littlefs2 to v0.5.0 trussed-secrets-app#124
• Update littlefs2 to v0.5.0 nitrokey-websmartcard-rust#25
• Update littlefs2 to v0.5.0 opcard-rs#214
• Update littlefs2 to v0.5.0 piv-authenticator#62
• Update littlefs2 to v0.5.0 trussed-dev/trussed-staging#30
• Update littlefs2 to v0.5.0 trussed-dev/trussed-auth#47
• Update littlefs2 to v0.5.0 trussed-se050-backend#42

[nitrokey-ci]

No significant changes.

Insignifcant changes

metric	value		change
binary-size-nk3am	1,366,906	✅	-8,476 (-0.62%)
binary-size-nk3am-test	1,878,038	✅	-11,086 (-0.59%)
binary-size-nk3xn	491,888	✅	-2,640 (-0.53%)
binary-size-nk3xn-test	539,152	✅	-1,960 (-0.36%)
binary-size-nkpk	709,547	✅	-6,133 (-0.86%)

[robin-nitrokey]

With this PR, trussed is the only crate outside of this repository that depends directly on littlefs2. (admin-app depends on littlefs2, but only for the migration-tests feature. Even the re-exports by trussed are not used by other crates.)

[sosthene-nitrokey]

And some binary size benefits too!. That was expected?

[robin-nitrokey]

The refactoring itself leads to a small increase in binary size because it removes the infallible conversions from strings and byte slices. But that is more than compensated by this little change.