chore(license): removes modified boilerplate from license file

[jwndlng]

This PR removes the modified appendix from the LICENSE file to ensure full compliance with the Apache 2.0 license, which should remain in its original, unmodified form. This change aligns our repositories with standard practices for license documentation.

[github-actions]

canbench 🏋 (dir: .) d9c0bf6 2025-08-27 06:36:45 UTC

✅ ./canbench_results.yml is up to date
📦 canbench_results_benchmark.csv available in artifacts

~/work/bitcoin-canister/bitcoin-canister/scripts ~/work/bitcoin-canister/bitcoin-canister
~/work/bitcoin-canister/bitcoin-canister
---------------------------------------------------

Benchmark: insert_300_blocks
  total:
    instructions: 506.99 M (-1.11%) (change within noise threshold)
    heap_increase: 10 pages (no change)
    stable_memory_increase: 0 pages (no change)

---------------------------------------------------

Benchmark: get_metrics
  total:
    instructions: 7.90 M (-0.00%) (change within noise threshold)
    heap_increase: 0 pages (no change)
    stable_memory_increase: 0 pages (no change)

---------------------------------------------------

Benchmark: insert_block_headers
  total:
    instructions: 3.17 B (0.00%) (change within noise threshold)
    heap_increase: 1 pages (no change)
    stable_memory_increase: 0 pages (no change)

---------------------------------------------------

Benchmark: insert_block_headers_multiple_times
  total:
    instructions: 11.69 B (0.00%) (change within noise threshold)
    heap_increase: 7 pages (no change)
    stable_memory_increase: 0 pages (no change)

---------------------------------------------------

Benchmark: pre_upgrade_with_many_unstable_blocks
  total:
    instructions: 5.99 B (0.00%) (change within noise threshold)
    heap_increase: 4097 pages (no change)
    stable_memory_increase: 1792 pages (no change)

  serialize_blocktree (scope):
    calls: 1 (no change)
    instructions: 2.40 B (no change)
    heap_increase: 2048 pages (no change)
    stable_memory_increase: 0 pages (no change)

  serialize_blocktree_flatten (scope):
    calls: 1 (no change)
    instructions: 183.80 K (no change)
    heap_increase: 0 pages (no change)
    stable_memory_increase: 0 pages (no change)

  serialize_blocktree_serialize_seq (scope):
    calls: 1 (no change)
    instructions: 2.40 B (no change)
    heap_increase: 2048 pages (no change)
    stable_memory_increase: 0 pages (no change)

---------------------------------------------------

Summary:
  instructions:
    status:   No significant changes 👍
    counts:   [total 5 | regressed 0 | improved 0 | new 0 | unchanged 5]
    change:   [max +14.00K | p75 +2.89K | median +1.40K | p25 -44 | min -5.67M]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 -0.00% | min -1.11%]

  heap_increase:
    status:   No significant changes 👍
    counts:   [total 5 | regressed 0 | improved 0 | new 0 | unchanged 5]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

  stable_memory_increase:
    status:   No significant changes 👍
    counts:   [total 5 | regressed 0 | improved 0 | new 0 | unchanged 5]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

---------------------------------------------------
CSV results saved to canbench_results.csv