Replace ureq with minreq for blocking

[tnull]

Taking this over from #57.

So far just a few minor adjustments on top of #57. Tested that syncing LDK works with the updated blocking client (in addition to the tests here).

[notmandatory]

You may need to pin some dependencies to get CI to build, see https://github.com/bitcoindevkit/bdk/blob/f099b42005b5310cee51fa2eaa29f94d76753bd7/.github/workflows/cont_integration.yml#L30C7-L36C49

[tnull]

You may need to pin some dependencies to get CI to build, see https://github.com/bitcoindevkit/bdk/blob/f099b42005b5310cee51fa2eaa29f94d76753bd7/.github/workflows/cont_integration.yml#L30C7-L36C49

Yes, however, I'm not sure if indiscriminately pinning (and advise the user to pin) potentially security-relevant libraries such as zstd is the best way forward, as it's really only test dependency but we would pin it for the entirety of the MSRV build, i.e., also for the entirety of the production build.

Maybe this would be the right time to fix this by downloading electrs/bitcoind via a shell script in CI rather than using electrsd's download feature which introduces a significant dependency tree? We did so when bumping LDK to 1.63 and it works like a charm. Would you accept such a change if I openend another PR to that end?

[notmandatory]

I'm much less concerned about pinning dev only dependencies so I don't see a reason to redo the CI to make progress on this PR. For BDK there's a PR to change the CI to use NIX which would also remove the auto-downloaded bitcoind / electrsd issue that required these broken for msrv dev dependencies (bitcoindevkit/bdk#1257). Once we get that PR into BDK we should be able to do something similar for this project with @storopoli 's help.

[storopoli]

Yeah count me in. Propagating Nix CI PRs throughout BDK's ecosystem should be a breeze after bitcoindevkit/bdk#1257

[notmandatory]

Rather than mixing the discussion and fixes for the MSRV issue into this PR I've create a stand-alone PR #76 for it.

[tnull]

I'm much less concerned about pinning dev only dependencies so I don't see a reason to redo the CI to make progress on this PR.

They may be dev dependencies for BDK, but you pin them for the entirety of the cargo build, and also advise users to do so. But can continue that discussion on #76.

[tnull]

Rebased after #76 landed and squashed fixup commits while I was at it.

[coveralls]

Pull Request Test Coverage Report for Build 8104429681

Details

• 111 of 148 (75.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+5.9%) to 84.837%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/blocking.rs	109	146	74.66%

Totals
Change from base Build 8096806272:	5.9%
Covered Lines:	912
Relevant Lines:	1075

---

💛 - Coveralls

[notmandatory]

I merged #79 so this PR should be re-based again.

[tnull]

I merged #79 so this PR should be re-based again.

Rebased.

[notmandatory]

I had to push another commit to fix the CI. Apparently the latest version of jobserver has an MSRV of 1.63 so we do not need to pin it anymore (and our old pinned version 1.26 does not work).

[notmandatory]

ACK 6a598b2