fix(type): fix heading type styles based on guidance and design kit (#12037)

* fix(type): fix heading type styles based on guidance and design kit

* chore: update type style test snapshot

Author: janhassel

packages/styles/scss/__tests__/__snapshots__/type-test.js.snap

@@ -1961,7 +1961,7 @@ Object {
         Object {
           "position": Position {
             "end": Object {
-              "column": 62,
+              "column": 66,
               "line": 182,
             },
             "source": undefined,
@@ -1972,7 +1972,7 @@ Object {
           },
           "property": "font-size",
           "type": "declaration",
-          "value": "var(--cds-productive-heading-06-font-size, 2rem)",
+          "value": "var(--cds-productive-heading-06-font-size, 2.625rem)",
         },
         Object {
           "position": Position {
@@ -2055,7 +2055,7 @@ Object {
           },
           "property": "font-size",
           "type": "declaration",
-          "value": "var(--cds-productive-heading-07-font-size, 2.625rem)",
+          "value": "var(--cds-productive-heading-07-font-size, 3.375rem)",
         },
         Object {
           "position": Position {
@@ -7617,7 +7617,7 @@ Object {
         Object {
           "position": Position {
             "end": Object {
-              "column": 51,
+              "column": 55,
               "line": 756,
             },
             "source": undefined,
@@ -7628,7 +7628,7 @@ Object {
           },
           "property": "font-size",
           "type": "declaration",
-          "value": "var(--cds-heading-06-font-size, 2rem)",
+          "value": "var(--cds-heading-06-font-size, 2.625rem)",
         },
         Object {
           "position": Position {
@@ -7711,7 +7711,7 @@ Object {
           },
           "property": "font-size",
           "type": "declaration",
-          "value": "var(--cds-heading-07-font-size, 2.625rem)",
+          "value": "var(--cds-heading-07-font-size, 3.375rem)",
         },
         Object {
           "position": Position {

packages/type/scss/_styles.scss

@@ -257,7 +257,7 @@ $heading-05: $productive-heading-05 !default;
 /// @access public
 /// @group @carbon/type
 $productive-heading-06: (
-  font-size: scale.type-scale(8),
+  font-size: scale.type-scale(10),
   font-weight: font-family.font-weight('light'),
   // Extra digit needed for precision in Chrome
   line-height: 1.199,
@@ -273,7 +273,7 @@ $heading-06: $productive-heading-06 !default;
 /// @access public
 /// @group @carbon/type
 $productive-heading-07: (
-  font-size: scale.type-scale(10),
+  font-size: scale.type-scale(12),
   font-weight: font-family.font-weight('light'),
   line-height: 1.19,
   letter-spacing: 0,