Bump esplora-client to 0.11

[tnull]

Bump esplora-client to 0.11
.. the most-recent release, which also dropped the async-std dependency in favor of a default sleeper implementation using tokio.

This is needed for compatibility with upcoming BDK versions.

[vincenzopalazzo]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.55%. Comparing base (d49a08a) to head (4d9bcf1).

Additional details and impacted files

@@ Coverage Diff @@## main #3348 +/- ##
==========================================
- Coverage 89.59% 89.55% -0.04% 
==========================================
Files 127 127 Lines 103438 103438 Branches 103438 103438 ==========================================
- Hits 92672 92631 -41 - Misses 8049 8082 +33 - Partials 2717 2725 +8 

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[tnull]

Might want to hold off until they fixed bitcoindevkit/rust-esplora-client#102

[tnull]

Should be good for review, now that they shipped esplora-client 0.11 which replaces the async-std dependency with a trait implementation defaulting to tokio at least, which users of this very likely already use to drive the async version.