Update the action to use node16 and incorporate the im-open standards.

[danielle-casella-adams]

Summary of PR changes

• Update to node 16
• Update builds/readme to be in line with im-open

PR Requirements

• For major, minor, or breaking changes, at least one of the commit messages contains the appropriate +semver: keywords.
  • See the Incrementing the Version section of the repository's README.md for more details.
• The action code does not contain sensitive information.

NOTE: If the repo's workflow could not automatically update the README.md, it should be updated manually with the next version. For javascript actions, if the repo's workflow could not automatically recompile the action it should also be updated manually as part of the PR.

[github-actions]

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	61.97	51.17	72	61.91
src	71.11	54.05	88.89	70.9
variableSubstitution.ts	71.11	54.05	88.89	70.9	...,211,212,215,216
src/operations	58.91	50.37	68.29	58.9
envVariableUtility.ts	100	84	100	100	15,45,67
fileEncodingUtility.ts	68.75	50	100	67.74	...4,46,48,50,60,66
jsonVariableSubstitutionUtility.ts	100	76.47	100	100	20,25,46
utility.ts	9.43	6	13.33	9.55	...,383,391,392,394
xmlDomUtility.ts	92.16	69.44	100	91.84	27,66,69,90
xmlVariableSubstitution.ts	91.21	86.76	100	91.21	...39,69,70,119,120

=============================== Coverage summary ===============================
Statements : 61.97% ( 334/539 )
Branches : 51.17% ( 175/342 )
Functions : 72% ( 36/50 )
Lines : 61.91% ( 330/533 )

[github-actions]

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	61.97	51.17	72	61.91
src	71.11	54.05	88.89	70.9
variableSubstitution.ts	71.11	54.05	88.89	70.9	...,211,212,215,216
src/operations	58.91	50.37	68.29	58.9
envVariableUtility.ts	100	84	100	100	15,45,67
fileEncodingUtility.ts	68.75	50	100	67.74	...4,46,48,50,60,66
jsonVariableSubstitutionUtility.ts	100	76.47	100	100	20,25,46
utility.ts	9.43	6	13.33	9.55	...,383,391,392,394
xmlDomUtility.ts	92.16	69.44	100	91.84	27,66,69,90
xmlVariableSubstitution.ts	91.21	86.76	100	91.21	...39,69,70,119,120

=============================== Coverage summary ===============================
Statements : 61.97% ( 334/539 )
Branches : 51.17% ( 175/342 )
Functions : 72% ( 36/50 )
Lines : 61.91% ( 330/533 )

[github-actions]

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	61.97	51.17	72	61.91
src	71.11	54.05	88.89	70.9
variableSubstitution.ts	71.11	54.05	88.89	70.9	...,191-192,207-216
src/operations	58.91	50.37	68.29	58.9
envVariableUtility.ts	100	84	100	100	15,45-67
fileEncodingUtility.ts	68.75	50	100	67.74	...3,29,44-50,60,66
jsonVariableSubstitutionUtility.ts	100	76.47	100	100	20-46
utility.ts	9.43	6	13.33	9.55	...0,71-383,391-394
xmlDomUtility.ts	92.16	69.44	100	91.84	27,66,69,90
xmlVariableSubstitution.ts	91.21	86.76	100	91.21	...39,69-70,119-120

=============================== Coverage summary ===============================

Statements : 61.97% ( 334/539 )

Branches : 51.17% ( 175/342 )

Functions : 72% ( 36/50 )

Lines : 61.91% ( 330/533 )

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