elliptic-curve: disable minimal-versions CI job (#2412)

The minimal versions job was broken (see [RustCrypto/actions#59]),
fixing it reveals that `elliptic-curve` still can not be built with
minimal dependency versions (see this [run][1]).

[RustCrypto/actions#59]: RustCrypto/actions#59
[1]: https://github.com/RustCrypto/traits/actions/runs/25738115143/job/75580587369

Author: newpavlov

.github/workflows/elliptic-curve.yml

@@ -62,6 +62,7 @@ jobs:
       - run: cargo build --target ${{ matrix.target }} --release --no-default-features --features alloc,digest,ecdh,pem,pkcs8,sec1,serde
 
   minimal-versions:
+    if: false
     uses: RustCrypto/actions/.github/workflows/minimal-versions.yml@master
     with:
       working-directory: ${{ github.workflow }}