chore(release): 1.2.0 (#30)

Bump 1.1.4 -> 1.2.0 across all release files (Cargo, pyproject, wasm,
conda, docs) and roll the CHANGELOG [Unreleased] section into [1.2.0].

Highlights: runtime CPU-feature dispatch (multiversion), broader wheel
coverage (linux aarch64 + musllinux + windows arm64), abi3 wheels,
Dynamic Time Warping, and indicator-specific exception types.

Cargo.lock

@@ -201,7 +201,7 @@ checksum = "48c757948c5ede0e46177b7add2e67155f70e33c07fea8284df6576da70b3719"
 
 [[package]]
 name = "ferro_ta"
-version = "1.1.4"
+version = "1.2.0"
 dependencies = [
  "criterion",
  "ferro_ta_core",
@@ -216,7 +216,7 @@ dependencies = [
 
 [[package]]
 name = "ferro_ta_core"
-version = "1.1.4"
+version = "1.2.0"
 dependencies = [
  "criterion",
  "multiversion",