flake.lock: Update

Flake lock file updates:

• Updated input 'haskell-nix':
    'github:input-output-hk/haskell.nix/5297ad9e688b8a6d1ae0e8297f5502bccb5511a5?narHash=sha256-vMdZsBgB73ae7fGAQJ5FOx/rC6v5GWpEGj8Y1rsPeJ8%3D' (2024-05-04)
  → 'github:input-output-hk/haskell.nix/3a86a9eaeed288f8625c910e0460e09eb5c68d30?narHash=sha256-FbfN34aH0333oD75izRu%2BDMFO9fRDywHv8fio/QBsgQ%3D' (2024-06-29)
• Removed input 'haskell-nix/ghc910X'
• Removed input 'haskell-nix/ghc911'
• Updated input 'haskell-nix/hackage':
    'github:input-output-hk/hackage.nix/d876911c2af96fece27d728105c924a18a75c2a7?narHash=sha256-ajcjX3GE88spXjFDq%2BJxC0/DHuHTejZLdrL0POsQ24k%3D' (2024-05-04)
  → 'github:input-output-hk/hackage.nix/7f6056018cb0d9f3ad70bcdafeb0ac755a4a3ee5?narHash=sha256-x1JBNd46flORH4OEZJDjDH5SX%2BRuDmhvrbKRGVMuXU0%3D' (2024-06-29)
• Added input 'haskell-nix/hls-2.8':
    'github:haskell/haskell-language-server/dd1be1beb16700de59e0d6801957290bcf956a0a?narHash=sha256-Vi/iUt2pWyUJlo9VrYgTcbRviWE0cFO6rmGi9rmALw0%3D' (2024-05-08)
• Updated input 'haskell-nix/iserv-proxy':
    'github:stable-haskell/iserv-proxy/2f2a318fd8837f8063a0d91f329aeae29055fba9?narHash=sha256-Rv%2BPajrnuJ6AeyhtqzMN%2BbcR8z9%2BaEnrUass%2BN951CQ%3D' (2024-02-25)
  → 'github:stable-haskell/iserv-proxy/2ed34002247213fc435d0062350b91bab920626e?narHash=sha256-7vE3RQycHI1YT9LHJ1/fUaeln2vIpYm6Mmn8FTpYeVo%3D' (2024-06-04)
• Updated input 'haskell-nix/stackage':
    'github:input-output-hk/stackage.nix/8869b1bdae290bce8c496aaba4e4083a3be2dc0b?narHash=sha256-6YWH%2BAMeOCRwT8iuQsmdj0hI5U1UpQC/vCrA%2BOycLrU%3D' (2024-05-04)
  → 'github:input-output-hk/stackage.nix/e087c88f59e36a6d31f1d5491507e3540593a2c6?narHash=sha256-WO1dq2Rl0PwAs1Kh6MHu%2Bn%2BXELY1S0mHfUeHmt74UE8%3D' (2024-06-29)