Refactor release scripts. (#2323)

It refactors the release scripts to centralize and simplify version updates across 
multiple files. Key changes include:

- Introducing variables (old_version, new_version, replace_str) for version substitution.
- Replacing hard-coded sed expressions with dynamic ones in various files.
- Ensuring backup files generated by sed are cleaned up after execution.

 #!/usr/bin/env bash
 
 set -ex
+old_version="1\.12\.2"
+new_version="1\.12\.3"
+replace_str="s/$old_version/$new_version/g"
 
-sed -i.bak 's/1\.12\.2/1\.12\.3/g' ./sherpa-onnx/csrc/version.cc
+sed -i.bak "$replace_str" ./sherpa-onnx/csrc/version.cc
 sha1=$(git describe --match=NeVeRmAtCh --always --abbrev=8)
 date=$(git log -1 --format=%ad --date=local)
 
 sed -i.bak "s/  static const char \*sha1.*/  static const char \*sha1 = \"$sha1\";/g" ./sherpa-onnx/csrc/version.cc
 sed -i.bak "s/  static const char \*date.*/  static const char \*date = \"$date\";/g" ./sherpa-onnx/csrc/version.cc
 
-sed -i.bak 's/1\.12\.2/1\.12\.3/g' ./build-ios-shared.sh
-sed -i.bak 's/1\.12\.2/1\.12\.3/g' ./pom.xml
-sed -i.bak 's/1\.12\.2/1\.12\.3/g' ./jitpack.yml
-sed -i.bak 's/1\.12\.2/1\.12\.3/g' ./android/SherpaOnnxAar/README.md
+sed -i.bak "$replace_str" ./build-ios-shared.sh
+sed -i.bak "$replace_str" ./pom.xml
+sed -i.bak "$replace_str" ./jitpack.yml
+sed -i.bak "$replace_str" ./android/SherpaOnnxAar/README.md
 
-find android -name build.gradle -type f -exec sed -i.bak 's/sherpa-onnx:v1\.12\.2/sherpa-onnx:v1\.12\.3/g' {} \;
+find android -name build.gradle -type f -exec sed -i.bak "s/sherpa-onnx:v$old_version/sherpa-onnx:v$new_version/g" {} \;
 
-find flutter -name *.yaml -type f -exec sed -i.bak 's/1\.12\.2/1\.12\.3/g' {} \;
-find dart-api-examples -name *.yaml -type f -exec sed -i.bak 's/1\.12\.2/1\.12\.3/g' {} \;
-find flutter-examples -name *.yaml -type f -exec sed -i.bak 's/1\.12\.2/1\.12\.3/g' {} \;
-find flutter -name *.podspec -type f -exec sed -i.bak 's/1\.12\.2/1\.12\.3/g' {} \;
-find nodejs-addon-examples -name package.json -type f -exec sed -i.bak 's/1\.12\.2/1\.12\.3/g' {} \;
-find nodejs-examples -name package.json -type f -exec sed -i.bak 's/1\.12\.2/1\.12\.3/g' {} \;
+find flutter -name "*.yaml" -type f -exec sed -i.bak "$replace_str" {} \;
+find dart-api-examples -name "*.yaml" -type f -exec sed -i.bak "$replace_str" {} \;
+find flutter-examples -name "*.yaml" -type f -exec sed -i.bak "$replace_str" {} \;
+find flutter -name "*.podspec" -type f -exec sed -i.bak "$replace_str" {} \;
+find nodejs-addon-examples -name package.json -type f -exec sed -i.bak "$replace_str" {} \;
+find nodejs-examples -name package.json -type f -exec sed -i.bak "$replace_str" {} \;
 
-find harmony-os -name "README.md" -type f -exec sed -i.bak 's/1\.12\.2/1\.12\.3/g' {} \;
-find harmony-os -name oh-package.json5 -type f -exec sed -i.bak 's/1\.12\.2/1\.12\.3/g' {} \;
+find harmony-os -name "README.md" -type f -exec sed -i.bak "$replace_str" {} \;
+find harmony-os -name oh-package.json5 -type f -exec sed -i.bak "$replace_str" {} \;
 
-find mfc-examples -name "README.md" -type f -exec sed -i.bak 's/1\.12\.2/1\.12\.3/g' {} \;
+find mfc-examples -name "README.md" -type f -exec sed -i.bak "$replace_str" {} \;
 
 find . -name "*.bak" -exec rm {} \;