Update to secrecy 0.10.

[tmpfs]

Requires pointing to a git dependency of pinentry for now which also needs updating.

One test (gen-stdout.toml) is failing using cargo +stable test but it also fails on main so I don't think it was introduced by these changes.

@str4d, if we can get a new version of pinentry published I can update the PR to remove the git dependency.

[codecov]

Codecov Report

Attention: Patch coverage is 38.88889% with 11 lines in your changes missing coverage. Please review.

Project coverage is 51.26%. Comparing base (baf277a) to head (766a3ed).

Files with missing lines	Patch %	Lines
age/src/ssh/identity.rs	0.00%	6 Missing ⚠️
age/src/cli_common.rs	0.00%	3 Missing ⚠️
age-plugin/src/identity.rs	0.00%	1 Missing ⚠️
age-plugin/src/recipient.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #543      +/-   ##
==========================================
+ Coverage   50.97%   51.26%   +0.28%     
==========================================
  Files          43       43              
  Lines        4159     4163       +4     
==========================================
+ Hits         2120     2134      +14     
+ Misses       2039     2029      -10     

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[str4d]

Replaced by #544 (which migrates to using the new secrecy APIs to reduce leakage of keys onto the stack).