flake.lock: Update

Flake lock file updates:

• Updated input 'fenix':
    'https://api.flakehub.com/f/pinned/nix-community/fenix/0.1.1924%2Brev-ebfe2c639111d7e82972a12711206afaeeda2450/01906d5e-442a-7bca-a2c1-55121965b1a0/source.tar.gz?narHash=sha256-K2xFp142onP35jcx7li10xUxNVEVRWjAdY8DSuR7Naw%3D' (2024-07-01)
  → 'https://api.flakehub.com/f/pinned/nix-community/fenix/0.1.1986%2Brev-28b42d01f549c38bd165296fbcb4fe66d98fc24f/0191aca7-e3ea-728d-bfd8-c4744f4a108d/source.tar.gz?narHash=sha256-BtLY9lWu/pe6/ImFwuRRRqMwLacY5AZOKA2hUHUQ64k%3D' (2024-09-01)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/ea7fdada6a0940b239ddbde2048a4d7dac1efe1e?narHash=sha256-fsxAuW6RxKZYjAP3biUC6C4vaYFhDfWv8lp1Tmx3ZCY%3D' (2024-06-30)
  → 'github:rust-lang/rust-analyzer/914a1caab54e48a028b2407d0fe6fade89532f67?narHash=sha256-TBujPMMIv8RG6BKlsBEpCln1ePmWz79xTcJOQpU2L18%3D' (2024-08-31)